ANIMAL PHYSIOLOGY
HUMAN CIRCULATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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have thicker wall
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composed of one layer of cells
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have many valves to keep blood flowing in one direction
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we can feel the pulse
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Detailed explanation-1: -The veins have thin walls. There are valves present in the veins that allows blood to flow only in one direction, towards the heart.
Detailed explanation-2: -Veins carry blood towards the heart. They have thin muscular walls with valves. Blood flows smoothly and under low pressure in the veins.
Detailed explanation-3: -Valves in the veins keep blood flowing in the correct direction. Two large veins that lead into the heart are the superior vena cava and inferior vena cava.
Detailed explanation-4: -Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood. Valves are actually flaps (leaflets) that act as one-way inlets for blood coming into a ventricle and one-way outlets for blood leaving a ventricle.