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E. If BP decreases, the kidneys secrete the enzyme renin, which stimulates the secretion of epinephrine to prevent a further decrease.G. The elasticity of the large arteries helps decrease diastolic BP.Correct Answers:A. The hormone ADH helps the kidneys conserve water and helps prevent a decrease in BP.C. If BP decreases, filtration in the kidneys decreases.F. If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises BP.Question 84 out of 8 pointsWhich of the following statements regarding the structure and function of blood vessels are true and which are false?QuestionCorrect MatchSelected MatchOnly veins and capillaries have valves, because BP is low within them.B. FalseA. True
The smooth muscle layer of arteries is thicker than that of veins.A. TrueA. TrueThe fibrous layer of arteries is thinner than that of veins.B. FalseB. FalseCapillaries are the continuation of the endothelium of arteries, and become the endothelium of veins.A. TrueB. FalseBlood flow into capillary networks is regulated by precapillary sphincters and their sympathetic nerves.B. FalseA. TrueSinusoids are located where capillaries need strong walls to prevent leaks.B. FalseB. FalseAn anastomosis is a connection between vessels of the same type that provides an alternate pathway for bloodflow.A. TrueA. TrueExchanges of materials between the blood and tissues take place in capillary networks.A. TrueB. FalseQuestion 94 out of 8 pointsWhich of the following statements regarding the circulation of blood are true and which are false?QuestionCorrect MatchSelected MatchPulmonary circulation begins at the left atrium and ends at the right ventricle.B. FalseB. FalseThe systemic arteries begin as branches of the aorta.A. TrueA. TrueThe amount of blood that circulates through an organ increases as the organ becomes more metabolically active.A. TrueB. FalseSystemic circulation begins at the left ventricle and endsat the right atrium.A. TrueB. FalseHepatic portal circulation enables the liver to store or modify substances in the blood coming from the digestive organs and spleen.A. TrueA. TrueThe two caval veins drain blood from the body, except for the head.B. FalseA. TrueBlood flow slows in capillaries but speeds up in veins.A. A.
TrueTrueBlood in veins is kept moving by external forces as well as constriction of the veins themselves.A. TrueB. FalseQuestion 109 out of 10 pointsWhich of the following statements regarding blood pressure are true and which are false?QuestionCorrect MatchSelected MatchIf BP decreases, filtration in the kidneys will increase to compensate.B. FalseB. FalseNormal systolic pressure created by the right ventricle is about 120 mmHg.