GENERAL ANATOMY
CARDIOVASCULAR SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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As the thickness of the blood decreases, the rate of blood flow increases.
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As the diameter of a blood vessel decreases, the rate of blood flow increases.
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As the length of a vein decreases, the resistance to blood flow decreases
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As blood pressure increases, the rate of blood flow decreases.
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Detailed explanation-1: -As the radius of the vessel lumen increases (called vasodilation), blood flow increases dramatically, and vice versa [1].
Detailed explanation-2: -Blood comes into the right atrium from the body, moves into the right ventricle and is pushed into the pulmonary arteries in the lungs. After picking up oxygen, the blood travels back to the heart through the pulmonary veins into the left atrium, to the left ventricle and out to the body’s tissues through the aorta.
Detailed explanation-3: -In blood vessels, most of the resistance is due to vessel diameter. As vessel diameter decreases, the resistance increases and blood flow decreases. Very little pressure remains by the time blood leaves the capillaries and enters the venules.
Detailed explanation-4: -Vasoconstriction, where the vessels constrict, decreases blood flow, and vasodilation, where the blood vessels expand, increases blood flow.