Biology
The diagram below depicts the human heart in one of its phases.
Answer the questions that follow:
(a) Which part of the heart is in the contraction phase?
(b) Give a suitable reason to justify your answer in (a).
(c) Distinguish between Systole and Diastole.
Circulatory System
ICSE 2023
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Answer
(a) Ventricles are in contraction phase
(b) Blood is passing into aorta and pulmonary artery through semilunar valves.
(c) Difference between Systole and Diastole:
| Systole | Diastole |
|---|---|
| Systole refers to contraction phase of the heart. | Diastole refers to expansion phase of the heart. |
| Systole consists of contraction of auricles followed by contraction of ventricles. | Diastole consists of relaxation of ventricles immediately followed by relaxation of auricles. |
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