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.
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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