ANIMAL PHYSIOLOGY
HUMAN CIRCULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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In each circuit, blood passes from the gut to the liver before going back to the heart.
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In each circuit, blood passes from the heart to the lungs and then back to the heart before going to other parts of the body.
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In each circuit, blood passes through atria and ventricles before going to other parts of the body.
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In each circuit, blood passes through the arteries and the capillaries before returning to the heart in veins.
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Detailed explanation-1: -It is called a double circulatory system because blood passes through the heart twice per circuit. The right pump sends deoxygenated blood to the lungs where it becomes oxygenated and returns back to the heart. The left pump sends the newly oxygenated blood around the body.
Detailed explanation-2: -Double circulation describes the fact that blood flows twice in the heart before it completes one full round. One is pulmonary circulation and the other is systemic circulation. Pulmonary circulation starts from the pulmonary artery which divides into two branches which enter the respective lungs.
Detailed explanation-3: -Double circulation supports a strict separation of both oxygenated and deoxygenated blood. Therefore, this circulation ensures that the body always has a dedicated supply of oxygen and also, it improves body efficiency. This is also one of the reasons why mammals can maintain their body temperatures.
Detailed explanation-4: -Double circulation of blood helps keep oxygenated (blood rich in oxygen) separate from deoxygenated (blood rich in carbon dioxide). This results in more efficient circulation of blood because a greater amount of oxygen-rich blood can be delivered to the tissues and it also maintain constant body temperature.
Detailed explanation-5: -A mechanism in which blood circulates twice through the heart in one complete cycle is known as double circulation. Systemic circulation and pulmonary circulation are two pathways in which the blood flows in double circulation. Double circulation is present in birds and mammals.