Question

b. Why are they not present all over the circulatory system?
c. Name the types of valves present inside the human heart.​

Answer 1

Explanation:

The heart has 4 valves:

• The mitral valve and tricuspid valve, which control blood flow from the atria to the ventricles.
• The aortic valve and pulmonary valve, which control blood flow out of the ventricles

Answer 2

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Ans B . A circulatory system is not needed in organisms with no specialized respiratory organs, such as unicellular organisms, because oxygen and carbon dioxide diffuse directly between their body tissues and the external environment.

Ans . C What are heart valves?

tricuspid valve: located between the right atrium and the right ventricle.

pulmonary valve: located between the right ventricle and the pulmonary artery.

mitral valve: located between the left atrium and the left ventricle.

aortic valve: located between the left ventricle and the aorta.

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