Class 6/Question Bank
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Questions on The Respiratory System
Instructions: Choose the correct answer from the given options.
The primary function of the respiratory system is: a) Digestion of food b) Exchange of gases c) Blood circulation d) Waste excretion
Which organ filters, warms, and moistens inhaled air? a) Larynx b) Trachea c) Nose d) Pharynx
The voice box is also known as: a) Pharynx b) Larynx c) Trachea d) Bronchi
The windpipe is scientifically called: a) Bronchi b) Larynx c) Pharynx d) Trachea
Gas exchange in the lungs occurs in: a) Bronchi b) Trachea c) Alveoli d) Larynx
The trachea is supported by: a) Flat bones b) C-shaped cartilaginous rings c) Muscles only d) Ligaments
Which structure contains vocal cords? a) Pharynx b) Trachea c) Larynx d) Bronchi
The pharynx is a common passageway for: a) Air only b) Food only c) Both air and food d) Blood only
The main bronchi divide into smaller: a) Alveoli b) Bronchioles c) Trachea d) Pharynx
Respiration is a: a) Physical process b) Biochemical process c) Mechanical process d) Chemical process only
Breathing is a: a) Biochemical process b) Physical process c) Cellular process d) Enzymatic process
Energy is released from food during: a) Breathing b) Respiration c) Inhalation d) Exhalation
Respiration occurs in: a) Lungs only b) Nose c) Cells (mitochondria) d) Trachea
Which process involves many enzymes? a) Breathing b) Respiration c) Inhalation d) Exhalation
During inhalation, the diaphragm: a) Relaxes and moves upward b) Contracts and moves downward c) Remains stationary d) Moves sideways
During exhalation, the ribs move: a) Upward and outward b) Downward and inward c) Sideways only d) Remain stationary
Intercostal muscles are associated with: a) Diaphragm b) Ribs c) Lungs d) Heart
When chest cavity volume increases, lung pressure: a) Increases b) Decreases c) Remains same d) Fluctuates
Air rushes into lungs when pressure inside is: a) Higher than outside b) Lower than outside c) Equal to outside d) Very high
Asthma is characterized by: a) Bacterial infection b) Chronic inflammation of airways c) Fluid in lungs d) Broken ribs
Bronchitis affects: a) Alveoli b) Trachea c) Bronchial tubes d) Nose
Pneumonia causes inflammation of: a) Bronchi b) Trachea c) Air sacs d) Pharynx
Tuberculosis is caused by: a) Virus b) Bacteria c) Fungus d) Allergy
Which disease mainly affects the lungs but can affect other body parts? a) Asthma b) Bronchitis c) Pneumonia d) Tuberculosis
Wheezing is a symptom of: a) Tuberculosis b) Asthma c) Heart disease d) Kidney disease
The nose contains receptors for: a) Taste b) Touch c) Smell d) Sound
How many main bronchi are there? a) One b) Two c) Three d) Four
The chest cavity is also called: a) Abdominal cavity b) Thoracic cavity c) Pelvic cavity d) Cranial cavity
During normal breathing, which muscle is most important? a) Heart muscle b) Diaphragm c) Arm muscle d) Leg muscle
Coughing with mucus is a symptom of: a) Asthma only b) Bronchitis c) Heart attack d) Kidney stones
The abbreviation T.B. stands for: a) Total Breathing b) Tuberculosis c) Throat Blockage d) Tiny Bacteria
Pneumonia may fill air sacs with: a) Air only b) Blood only c) Fluid or pus d) Mucus only
Which is NOT a function of the nose? a) Filtering air b) Warming air c) Producing sound d) Moistening air
The larynx connects to: a) Esophagus b) Trachea c) Stomach d) Heart
Difficulty breathing is called: a) Dyspnea b) Tachycardia c) Hypertension d) Diabetes
Which gas is taken in during breathing? a) Carbon dioxide b) Oxygen c) Nitrogen d) Hydrogen
Which gas is expelled during breathing? a) Oxygen b) Carbon dioxide c) Nitrogen d) Helium
The windpipe divides into: a) Alveoli b) Bronchi c) Pharynx d) Larynx
Chronic means: a) Temporary b) Long-lasting c) Painful d) Infectious
Air sacs in lungs are called: a) Bronchi b) Bronchioles c) Alveoli d) Trachea
The process of taking air in is called: a) Exhalation b) Inhalation c) Respiration d) Circulation
The process of giving air out is called: a) Inhalation b) Exhalation c) Respiration d) Digestion
Which structure prevents the trachea from collapsing? a) Muscles b) Bones c) Cartilaginous rings d) Ligaments
Inflammation of airways is seen in: a) Heart disease b) Asthma c) Kidney stones d) Broken bones
Fever and chills are symptoms of: a) Asthma b) Simple cold c) Pneumonia d) Healthy breathing
The respiratory system works with which other system for gas transport? a) Digestive system b) Circulatory system c) Nervous system d) Skeletal system
During exercise, breathing rate: a) Decreases b) Increases c) Stops d) Remains same
Which is the correct breathing pathway? a) Nose → Larynx → Pharynx → Trachea b) Nose → Pharynx → Larynx → Trachea c) Nose → Trachea → Pharynx → Larynx d) Larynx → Nose → Pharynx → Trachea
Chest tightness is a symptom of: a) Good health b) Asthma c) Strong muscles d) Proper diet
The primary organs of respiration are: a) Heart and liver b) Kidneys c) Lungs d) Brain and spinal cord
Intercostal muscles are located between: a) Bones of arms b) Ribs c) Leg bones d) Skull bones
When diaphragm relaxes, it moves: a) Downward b) Upward c) Sideways d) In circles
Bacterial infection of lungs may cause: a) Asthma b) Pneumonia c) Heart attack d) Broken ribs
Which disease is infectious? a) Asthma b) Tuberculosis c) Broken bones d) Heart attack
Olfactory receptors are found in: a) Eyes b) Ears c) Nose d) Mouth
The trachea is approximately how long in adults? a) 2-3 cm b) 10-12 cm c) 20-25 cm d) 50 cm
How many alveoli are approximately in human lungs? a) Thousands b) Millions c) Hundreds of millions d) Billions
Which muscle contracts during inhalation? a) Heart muscle b) Diaphragm c) Stomach muscle d) Brain muscle
The voice is produced by vibration of: a) Trachea b) Bronchi c) Vocal cords d) Alveoli
Mucus production increases in: a) Healthy lungs b) Bronchitis c) Strong breathing d) Exercise
Air enters the body through: a) Mouth only b) Nose only c) Both nose and mouth d) Ears
The epiglottis prevents food from entering: a) Stomach b) Esophagus c) Trachea d) Mouth
Smoking primarily affects: a) Heart only b) Respiratory system c) Kidneys only d) Bones only
Oxygen is carried in blood by: a) White blood cells b) Platelets c) Red blood cells d) Plasma only
Carbon dioxide is a: a) Useful gas for body b) Waste product c) Essential nutrient d) Vitamin
Hiccups involve spasms of: a) Heart b) Diaphragm c) Liver d) Kidneys
The right lung has how many lobes? a) One b) Two c) Three d) Four
The left lung has how many lobes? a) One b) Two c) Three d) Four
Respiratory rate is usually measured in: a) Breaths per second b) Breaths per minute c) Breaths per hour d) Breaths per day
Normal respiratory rate for adults is approximately: a) 5-8 breaths per minute b) 12-20 breaths per minute c) 30-40 breaths per minute d) 50-60 breaths per minute
Which is NOT a respiratory disease mentioned? a) Asthma b) Bronchitis c) Diabetes d) Pneumonia
Cellular respiration produces: a) Oxygen b) Carbon dioxide c) Nitrogen d) Hydrogen
The pleura is: a) A lung disease b) Membrane covering lungs c) Part of heart d) Breathing muscle
Expiration is another term for: a) Inhalation b) Exhalation c) Respiration d) Circulation
Inspiration is another term for: a) Exhalation b) Inhalation c) Circulation d) Digestion
The medulla oblongata controls: a) Heartbeat only b) Breathing rhythm c) Digestion only d) Vision only
High altitude affects breathing because of: a) More oxygen b) Less oxygen c) More carbon dioxide d) Cold temperature only
Artificial respiration is given when: a) Person is healthy b) Person stops breathing c) Person is sleeping d) Person is eating
Spirometer measures: a) Heart rate b) Blood pressure c) Lung capacity d) Body temperature
Vital capacity refers to: a) Heart pumping ability b) Maximum air lungs can hold c) Kidney function d) Brain activity
Residual volume is: a) Air always in lungs b) Air breathed out c) Air breathed in d) Total lung capacity
Tidal volume is: a) Air in normal breathing b) Maximum air capacity c) Air left in lungs d) Air in deep breathing
Which gas makes up most of atmospheric air? a) Oxygen b) Carbon dioxide c) Nitrogen d) Hydrogen
Oxygen percentage in atmospheric air is approximately: a) 78% b) 21% c) 1% d) 50%
Carbon dioxide percentage in atmospheric air is approximately: a) 21% b) 78% c) 0.03% d) 10%
Hyperventilation means: a) Normal breathing b) Fast, deep breathing c) Slow breathing d) No breathing
Hypoventilation means: a) Fast breathing b) Slow, shallow breathing c) Normal breathing d) Deep breathing
Apnea means: a) Fast breathing b) Slow breathing c) Temporary stopping of breathing d) Deep breathing
The Adam's apple is part of: a) Throat b) Larynx c) Trachea d) Esophagus
Cilia in respiratory tract help in: a) Gas exchange b) Filtering and cleaning air c) Sound production d) Smell detection
Surfactant in alveoli helps in: a) Gas exchange b) Preventing collapse c) Sound production d) Mucus production
Which cells produce surfactant? a) Red blood cells b) White blood cells c) Pneumocytes d) Nerve cells
Emphysema affects: a) Heart b) Alveoli c) Kidneys d) Brain
Chronic obstructive pulmonary disease (COPD) includes: a) Heart diseases b) Emphysema and chronic bronchitis c) Kidney diseases d) Brain disorders
Pulmonary edema involves: a) Dry lungs b) Fluid accumulation in lungs c) No air in lungs d) Extra air in lungs
Which hormone can affect breathing rate? a) Insulin b) Adrenaline c) Growth hormone d) Thyroid hormone
The phrenic nerve controls: a) Heart b) Diaphragm c) Liver d) Kidneys
Cheyne-Stokes breathing is: a) Normal breathing b) Abnormal breathing pattern c) Fast breathing d) Slow breathing
Peak flow meter measures: a) Heart rate b) Maximum speed of exhaled air c) Blood pressure d) Body temperature
Respiratory quotient (RQ) is the ratio of: a) O₂ consumed to CO₂ produced b) CO₂ produced to O₂ consumed c) Heart rate to breathing rate d) Lung capacity to body weight
Instructions: Write brief answers in one or two sentences.
Instructions: Provide detailed answers explaining the concepts clearly.
Explain the difference between respiration and breathing with two points each.
Describe the mechanism of inhalation including the role of diaphragm and ribs.
Explain the mechanism of exhalation and how it differs from inhalation.
List the main parts of the respiratory system and state one function of each.
Compare the location and enzyme involvement between respiration and breathing.
Describe three main symptoms of asthma and explain why they occur.
Explain bronchitis: what it is, what causes it, and its main symptoms.
Describe pneumonia including what happens to the air sacs and common symptoms.
Explain tuberculosis as a disease, mentioning its cause and primary affected organ.
Describe the pathway of air from nose to lungs, naming all structures involved.
Explain the role of cartilaginous rings in the trachea and why they are C-shaped.
Describe the structure and function of alveoli in gas exchange.
Explain how the pharynx functions as a common passageway and what it connects.
Describe the larynx, its location, and its two main functions.
Explain the relationship between chest cavity volume and lung pressure during breathing.
Compare the energy aspects of respiration and breathing processes.
Describe the role of intercostal muscles in the breathing mechanism.
Explain why the nose is important in respiratory function with three specific reasons.
Describe how bronchi and bronchioles are related and their functions.
Explain the difference between chronic and acute respiratory conditions with examples.
Describe what happens during gas exchange in the lungs and where it occurs.
Explain the importance of the respiratory system working with the circulatory system.
Describe three ways the respiratory system protects itself from harmful substances.
Explain how breathing rate changes during exercise and why this happens.
Describe the consequences of respiratory diseases on normal breathing function.
Instructions: Provide comprehensive answers with detailed explanations, examples, and reasoning.
Draw a labeled diagram of the respiratory system and explain the function of each labeled part in detail.
Explain the complete mechanism of breathing including both inhalation and exhalation phases. Describe the role of muscles, pressure changes, and air movement.
Compare and contrast respiration and breathing in detail. Include differences in process type, location, energy involvement, and enzymes. Provide examples to support your explanation.
Describe four major respiratory diseases mentioned in the text. For each disease, explain the cause, main symptoms, affected parts, and distinguishing features.
Explain the pathway of air from the external environment to the site of gas exchange. Describe what happens to the air at each stage and the importance of each structure.
Analyze the importance of the diaphragm in breathing. Explain its structure, location, nerve supply, and detailed mechanism of action during both phases of breathing.
Discuss the role of pressure differences in breathing mechanism. Explain how pressure changes occur, why air moves, and what happens when this mechanism is disrupted.
Explain the protective mechanisms of the respiratory system. Describe how the nose, trachea, and other structures protect the lungs from harmful substances and pathogens.
Analyze the relationship between the respiratory and circulatory systems. Explain how they work together for gas transport and what happens when either system fails.
Describe the structure and function of alveoli in detail. Explain their design features that make them efficient for gas exchange and what can go wrong with them.
Explain asthma as a chronic respiratory condition. Describe its pathophysiology, triggers, symptoms, and how it affects normal breathing mechanism.
Discuss tuberculosis as an infectious respiratory disease. Explain its causative agent, transmission, symptoms, affected organs, and why it's considered serious.
Analyze pneumonia and its effects on respiratory function. Explain different types, causes, how it affects gas exchange, and its symptoms.
Explain the concept of lung volumes and capacities. Describe tidal volume, vital capacity, and residual volume with their significance in respiratory health.
Discuss the neural control of breathing. Explain which parts of the brain are involved, how breathing rhythm is maintained, and what can affect this control.
Analyze the effects of environmental factors on respiratory health. Discuss pollution, altitude, temperature, and humidity effects on breathing and lung function.
Explain the emergency responses of the respiratory system. Describe what happens during breath-holding, choking, and how artificial respiration works.
Discuss the age-related changes in respiratory function. Explain how breathing mechanism and lung capacity change with age and their implications.
Analyze the role of respiratory system in maintaining body pH. Explain how breathing rate changes affect acid-base balance and body homeostasis.
Explain respiratory adaptations during physical exercise. Describe immediate and long-term changes in breathing pattern, lung function, and oxygen utilization.
Discuss smoking effects on the respiratory system. Explain how tobacco affects different parts of respiratory system and leads to various diseases.
Analyze sleep-related breathing disorders. Explain sleep apnea, its causes, effects on health, and relationship with normal breathing mechanism.
Explain respiratory first aid measures. Describe techniques for helping someone with breathing difficulties, when to use them, and their scientific basis.
Discuss occupational respiratory diseases. Explain how work environment can affect lung health, give examples, and describe prevention measures.
Analyze the future of respiratory health. Discuss emerging respiratory diseases, treatment advances, and preventive measures for maintaining healthy respiratory function.
Respiratory System Diagram & Functions: (A diagram would be drawn here).
Complete Mechanism of Breathing: Breathing involves two phases. Inhalation is an active process where the diaphragm contracts and flattens, and the external intercostal muscles contract, lifting the rib cage up and out. This combined action increases the volume of the thoracic cavity, causing the pressure within the lungs to drop below atmospheric pressure, and air rushes in. Exhalation is usually passive. The diaphragm and intercostal muscles relax, the chest cavity recoils to its smaller resting size, which increases the pressure in the lungs above atmospheric pressure, forcing air out.
Respiration vs. Breathing Comparison:
Four Major Respiratory Diseases:
Pathway of Air: Air enters the nose, where it is filtered, warmed, and humidified. It then passes through the pharynx and into the larynx. From the larynx, it travels down the trachea, which is kept open by cartilage rings. The trachea splits into two bronchi, which enter the lungs and branch into smaller bronchioles. Finally, the air reaches the alveoli, tiny air sacs where the critical exchange of oxygen and carbon dioxide with the blood occurs.
Importance of the Diaphragm: The diaphragm is the primary muscle of respiration. It is a large, dome-shaped sheet of muscle located at the base of the thoracic cavity. It is innervated by the phrenic nerve. During inhalation, it contracts and flattens, dramatically increasing the vertical dimension of the chest cavity. This action is responsible for about 75% of the air movement in normal, quiet breathing. Its relaxation during exhalation allows the chest cavity to shrink, pushing air out.
Role of Pressure Differences in Breathing: Breathing operates on the principle of Boyle's Law, where pressure and volume are inversely related. During inhalation, the contraction of the diaphragm and intercostal muscles increases the lung volume, which decreases the intrapulmonary pressure to below atmospheric pressure, causing air to flow in. During exhalation, the relaxation of these muscles decreases lung volume, increasing the intrapulmonary pressure above atmospheric pressure, causing air to flow out. Any condition that prevents these volume changes, like a punctured lung, disrupts this pressure gradient and can cause breathing to fail.
Protective Mechanisms of the Respiratory System: The system has several lines of defense. The nose acts as a first-line filter with its hairs and mucus. The entire respiratory tract, from the trachea to the bronchi, is lined with a mucociliary escalator, where cilia continuously beat upward, moving mucus-trapped debris out of the lungs. Finally, powerful reflex actions like coughing and sneezing forcefully expel larger irritants from the pharynx, larynx, or trachea.
Respiratory and Circulatory System Relationship: These two systems are inextricably linked in a process of gas transport. The respiratory system acquires oxygen from the atmosphere and removes carbon dioxide from the body. The circulatory system, via the blood and heart, acts as the transport medium. Blood picks up oxygen in the lungs, delivers it to the body's tissues for cellular respiration, and picks up the waste product, carbon dioxide, to be transported back to the lungs for exhalation. A failure in one system (e.g., a heart attack or lung disease) will critically impair the function of the other.
Alveoli Structure and Function: Alveoli are the functional units of the lungs. They are microscopic, grape-like clusters of air sacs with incredibly thin walls (one cell thick) to facilitate rapid gas diffusion. Their effectiveness is enhanced by a massive total surface area (equivalent to a tennis court) and a dense network of surrounding capillaries, ensuring a minimal distance for gases to travel between air and blood. A substance called surfactant prevents the alveoli from collapsing during exhalation.
Asthma Explained: Asthma is a chronic condition where the airways become inflamed, swollen, and hypersensitive. When exposed to triggers (like pollen, dust, or cold air), the smooth muscles around the airways constrict (bronchospasm), and excess mucus is produced. This combination severely narrows the airways, making it difficult for air to move in and out, leading to the characteristic symptoms of wheezing, shortness of breath, and chest tightness.
Tuberculosis Explained: Tuberculosis is a contagious and potentially fatal infectious disease caused by the bacterium Mycobacterium tuberculosis. It is transmitted through airborne droplets from the coughs or sneezes of an infected person. While it primarily attacks the lungs, causing a chronic cough, fever, and weight loss, it can spread to other parts of the body. It is considered serious because the bacteria can remain dormant for years and become active later, and drug-resistant strains are a growing concern.
Pneumonia Analysis: Pneumonia is an inflammation of the lung tissue, specifically the alveoli, usually caused by infection. The infection leads to the air sacs filling with fluid or pus, which severely interferes with the ability of oxygen to diffuse into the bloodstream. This results in hypoxemia (low blood oxygen). Symptoms reflect this struggle, including high fever, chills, a productive cough, and significant difficulty breathing.
Lung Volumes and Capacities:
Neural Control of Breathing: Breathing is controlled by the respiratory centers in the medulla oblongata and pons of the brainstem. The medulla sets the basic rhythm of breathing. These centers receive input from chemoreceptors that monitor the levels of oxygen, carbon dioxide, and pH in the blood. High CO2 levels are the primary stimulus for increasing the rate and depth of breathing. While the basic rhythm is involuntary, it can be temporarily overridden by conscious control from the cerebral cortex.
Environmental Factors on Respiratory Health:
Emergency Respiratory Responses:
Age-Related Changes in Respiration: With age, the respiratory system becomes less efficient. The chest wall becomes more rigid, respiratory muscles weaken, and the elastic recoil of the lungs decreases. This leads to a reduction in vital capacity and makes it harder to cough effectively, increasing the risk of respiratory infections like pneumonia.
Respiratory System and pH Balance: The respiratory system plays a crucial role in maintaining the body's acid-base balance. Carbon dioxide combines with water in the blood to form carbonic acid. By adjusting the rate and depth of breathing, the body can regulate the amount of CO2 in the blood. For example, if the blood becomes too acidic, the breathing rate increases to blow off more CO2, thus reducing the acidity.
Respiratory Adaptations to Exercise: During exercise, the respiratory system makes immediate adjustments by increasing the rate and depth of breathing to meet the body's heightened demand for oxygen and to remove excess carbon dioxide. With long-term training, the respiratory muscles become stronger and more efficient, vital capacity may increase slightly, and the body becomes better at extracting oxygen from the air.
Smoking Effects on Respiratory System: Smoking is devastating to the respiratory system. It paralyzes and destroys the cilia, leading to a buildup of mucus (smoker's cough) and increased infections. It irritates the airways, causing chronic bronchitis, and destroys the delicate alveolar walls, leading to emphysema. It is also the leading cause of lung cancer.
Sleep-Related Breathing Disorders: Sleep apnea is a common disorder where a person repeatedly stops and starts breathing during sleep. The most common type, obstructive sleep apnea, occurs when the throat muscles relax and block the airway. These episodes of apnea lead to poor sleep quality, daytime sleepiness, and can increase the risk of high blood pressure, heart attack, and stroke.
Respiratory First Aid: For someone choking, the Heimlich maneuver is the standard response. For someone who has stopped breathing, cardiopulmonary resuscitation (CPR), which combines chest compressions with rescue breaths (artificial respiration), is critical to circulate oxygenated blood until emergency medical services arrive.
Occupational Respiratory Diseases: Many occupations expose workers to substances that can harm the lungs. For example, coal miners can develop black lung disease from coal dust. Construction workers exposed to asbestos can develop asbestosis and mesothelioma. Prevention involves proper ventilation, wearing protective masks, and minimizing exposure to harmful dusts and chemicals.
Future of Respiratory Health: The future will likely see challenges from emerging respiratory viruses (like new strains of influenza or coronaviruses) and the effects of climate change and pollution. Advances in treatment may include personalized medicine for conditions like asthma and cystic fibrosis, new antiviral drugs, and improved vaccine technologies. Prevention will remain key, focusing on smoking cessation, air quality control, and global surveillance for new pathogens.
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