SCIENCE
CIRCULATORY SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Arteries
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Capillaries
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Veins
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Lymph vessels
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Detailed explanation-1: -Pulmonary veins carry oxygen-filled blood to the heart. They transport blood in smooth flow without any jerk as the amount of blood that enters the heart is controlled by the valves present.
Detailed explanation-2: -Are capillaries evenly distributed in the body? No, Tissues with high metabolic rates such as the liver, kidneys and myocardium have large numbers of capillaries.
Detailed explanation-3: -Summary: Each time a blood vessel splits into smaller vessels, red blood cells (RBCs) are presented with the same decision: Take the left capillary or the right. While one might think RBCs would divide evenly at every fork in the road, it is known that at some junctures, RBCs seem to prefer one vessel over the other.
Detailed explanation-4: -Blood flow through the capillary beds is controlled by precapillary sphincters to increase and decrease flow depending on the body’s needs and is directed by nerve and hormone signals. Lymph vessels take fluid that has leaked out of the blood to the lymph nodes where it is cleaned before returning to the heart.