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CBSE/NCERT/NCERT Biology Activities/Class 11 Biology Activities

Class 11 Biology - Chapter_14_Chapter_14_Biological_Concepts

NCERT Biology Activities for Class 11 Biology - Chapter_14_Chapter_14_Biological_Concepts - Class_11_Biology

Class 11 Biology - Chapter_16_Chapter_16_Biological_Concepts

NCERT Biology Activities for Class 11 Biology - Chapter_16_Chapter_16_Biological_Concepts - Class_11_Biology

Created by Titas Mallick

Biology Teacher • M.Sc. Botany • B.Ed. • CTET (CBSE) • CISCE Examiner

CBSE/NCERT/NCERT Biology Activities/Class 11 Biology Activities

Class 11 Biology - Body Fluids and Circulation

NCERT Biology Activities for Class 11 Biology - Body Fluids and Circulation - Class_11_Biology

Class 11 Biology - Body Fluids and Circulation

Activities

Activity 15.1: Measuring Pulse Rate and Heart Sounds

Aim/Objective: To observe the relationship between heart activity and pulse rate.

Materials Required:

A stopwatch
Stethoscope (optional)
Notebook

Procedure:

Place your index and middle fingers on the inner side of your wrist (radial artery).
Count the number of pulses felt in one minute while at rest.
If a stethoscope is available, place it on the left side of the chest to listen to the 'lub-dub' sounds.
Perform mild exercise (e.g., 20 jumping jacks) and measure the pulse rate again.

Observation:

The pulse rate increases significantly after physical activity. The heart sounds become faster and more distinct.

Explanation:

Each pulse corresponds to a ventricular systole (contraction) that pumps blood into the arteries. The 'lub' sound is the closure of the tricuspid and bicuspid valves, and 'dub' is the closure of semilunar valves. Exercise increases the body's oxygen demand, prompting the sino-atrial node (pacemaker) to increase the heart rate to maintain adequate cardiac output.

Conclusion:

Pulse rate is a direct indicator of heart rate and responds dynamically to the body's energy needs.

location:

/CBSE/NCERT/Activities/Class_11_Biology/Chapter_15_Chapter_15_Biological_Concepts.mdx

Class 11 Biology - Chapter_14_Chapter_14_Biological_Concepts

NCERT Biology Activities for Class 11 Biology - Chapter_14_Chapter_14_Biological_Concepts - Class_11_Biology

Class 11 Biology - Chapter_16_Chapter_16_Biological_Concepts

NCERT Biology Activities for Class 11 Biology - Chapter_16_Chapter_16_Biological_Concepts - Class_11_Biology

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Class 11 Biology - Body Fluids and Circulation Activities Activity 15.1: Measuring Pulse Rate and Heart Sounds