Question

Explain the events in the cardiac cycle. Describe ‘double circulation’.

Answer 1

Explanation:

The cardiac cycle comprises a complete relaxation and contraction of both the atria and ventricles, and lasts approximately 0.8 seconds. Beginning with all chambers in diastole, blood flows passively from the veins into the atria and past the atrioventricular valves into the ventricles.

Answer 2

Answer:

double circulatoin prevent the mixing of oxygenated and deoxygenated blood.Therfore,all the body parts receive an efficient supply of oxygenated blood.This is beneficial for animal such as mammals and birds which have high energy needs in order to maintain their body temperature

Explanation:

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