Question

Which of the following is true of vertebrates with four-chambered hearts? There is a partial mixing of oxygen-rich and oxygen-poor blood. There is no mixing of oxygen-rich and oxygen-poor blood. There is a partial gas exchange in one chamber of the heart. There is a complete mixing of oxygen-rich and oxygen-poor blood

Answer 1

There is no mixing of oxygen-rich and oxygen-poor blood.

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The right atrium and right ventricle of the human heart pump oxygen-poor blood to the lungs and the left atrium receives oxygen-rich blood. They never mix.

Answer 2

Answer:

Option (2).

Explanation:

Human heart is divided into four chambers with two atrium and two ventricles. The blood flows from the atria to the right ventricles to the lungs. The left atrium receive oxygenated blood and pumps to the left ventricle to the body.

The division of chambers in the heart prevents the mixing of oxygenated and deoxygenated blood. Humans are exothermic animals and spends energy to maintain their internal environment. Nature has already separated the oxygenated and deoxygenated blood to prevent the expense of energy.

Thus, the correct answer is option (2).