Breathing and Exchange of Gases - Competency Based & Assertion-Reasoning Questions
Practice questions testing deep understanding of respiratory volumes, oxygen dissociation, and gas transport.
Excretory Products and Their Elimination - Competency Based & Assertion-Reasoning Questions
Practice questions testing deep understanding of counter-current mechanism, RAAS, and kidney function.
Created by Titas Mallick
Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner
Practice questions testing deep understanding of cardiac cycle, ECG, and blood coagulation.
Q1. The Sinoatrial (SA) Node is called the natural "pacemaker" of the heart. If the SA node completely fails due to disease, the Atrioventricular (AV) node will take over as the pacemaker. However, the person's resting heart rate will drop from a normal 72 beats per minute down to about 40 beats per minute. Explain why this drop occurs based on the properties of nodal tissue.
Q2. During a severe cut, a complex biochemical cascade occurs to form a blood clot and stop the bleeding. In the final step of this cascade, the enzyme Thrombin is activated. Describe the exact action of Thrombin that physically creates the structure of the blood clot.
Q3. Assertion (A): In an Electrocardiogram (ECG), the QRS complex represents the depolarization of the ventricles. Reason (R): Immediately following the QRS complex, the massive muscular walls of the ventricles undergo powerful contraction (systole) to pump blood out of the heart.
/Class-11/Competency-Based-Questions/5.2_Body_Fluids_and_Circulation_CBQ.mdxBreathing and Exchange of Gases - Competency Based & Assertion-Reasoning Questions
Practice questions testing deep understanding of respiratory volumes, oxygen dissociation, and gas transport.
Excretory Products and Their Elimination - Competency Based & Assertion-Reasoning Questions
Practice questions testing deep understanding of counter-current mechanism, RAAS, and kidney function.