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Questions and Answers
What is the actual volume of blood flowing through a vessel, an organ, or the entire circulation in a given period?
What is the force per unit area exerted on the wall of a blood vessel by its contained blood?
What is the measure of the amount of friction blood encounters as it passes through vessels?
What are the three important sources of resistance?
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How does resistance vary with vessel radius?
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What is the equation for blood pressure?
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Which chemicals increase blood pressure?
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What are the three types of circulatory shock?
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What are the factors aiding venous return?
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What chemicals decrease blood pressure?
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What is the major function of valves during venous return?
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What is the main factor influencing blood pressure?
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Which type of blood vessel is responsible for controlling flow into capillary beds via vasodilation and constriction?
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What is the main component of the tunica media in elastic (conducting) arteries?
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Which type of capillary allows only a single red blood cell to pass at a time?
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What is the main function of venules in the circulatory system?
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What is the main difference in the composition of tunica media between muscular arteries and elastic arteries?
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What is the main function of veins in the circulatory system?
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What is the main difference in blood pressure between veins and arteries?
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What is the main function of the tunica externa (tunica adventitia) of blood vessels?
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What is the main function of capillary beds in the circulatory system?
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Which type of artery has the largest lumen and allows low-resistance conduction of blood?
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What is the main function of postcapillary venules in the circulatory system?
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What is the main component of the walls of capillaries?
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Blood flow is equivalent to cardiac output (CO), considering the entire vascular system
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Blood pressure is highest in the right atrium
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Maintaining blood pressure requires the supervision of the brain
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Chemicals that decrease blood pressure include endothelium-derived factors
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Vascular shock results from extreme vasoconstriction
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Arteries always carry blood away from the heart, while veins always carry blood toward the heart.
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Capillaries have walls consisting of a thin tunica media, one cell thick, and allow only a single red blood cell to pass at a time.
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Venules are formed when capillary beds unite and allow fluids and white blood cells to pass from the bloodstream to tissues.
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Veins have much lower blood pressure and thinner walls than arteries.
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Venules are the smallest blood vessels and are composed of endothelium and a few pericytes.
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Veins have thicker walls than arteries.
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Muscular arteries are responsible for controlling flow into capillary beds via vasodilation and constriction.
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The tunica externa of blood vessels is composed of collagen fibers that protect and reinforce the vessels.
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The force per unit area exerted on the wall of a blood vessel by its contained blood is known as blood flow.
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Capillaries are the largest blood vessels in the circulatory system.
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Blood pressure is expressed in centimeters of mercury (cm Hg)
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The steepest change in blood pressure occurs in the arterioles
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Chemicals that decrease blood pressure include norepinephrine and epinephrine
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Maintaining blood pressure requires cooperation of the heart, blood vessels, and lungs
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Resistance varies inversely with the fourth power of vessel radius
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