Question

1. Why is the heart not fatigued even though it beats
non-stop throughout the life of an individual?

2. . Define systemic circulation. State the significance
of systemic circulation in our body.

3. State the path of blood during. systemic circulation.

4. What is double circulation? How does it occur?

5. The blood should not flow backwards through the
heart. Explain.​

Answer 1

Answer:

4 . double circulation

the type of circulatory system that occurs in mammals, in which the blood passes through the heart twice before completing a full circuit of the body.