E I f BP decreases the kidneys secrete the enzyme renin which stimulates the

E i f bp decreases the kidneys secrete the enzyme

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E. I f 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 8 4 out of 8 points Which of the following statements regarding the structure and function of blood vessels are true and which are false? Question Correct Match Selected Match Only veins and capillaries have valves, because BP is low within them. B. False A. True
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The smooth muscle layer of arteries is thicker than that of veins. A. True A. True The fibrous layer of arteries is thinner than that of veins. B. False B. False Capillaries are the continuation of the endothelium of arteries, and become the endothelium of veins. A. True B. False Blood flow into capillary networks is regulated by precapillary sphincters and their sympathetic nerves. B. False A. True Sinusoids are located where capillaries need strong walls to prevent leaks. B. False B. False An anastomosis is a connection between vessels of the same type that provides an alternate pathway for blood flow. A. True A. True Exchanges of materials between the blood and tissues take place in capillary networks. A. True B. False Question 9 4 out of 8 points Which of the following statements regarding the circulation of blood are true and which are false? Question Correct Match Selected Match Pulmonary circulation begins at the left atrium and ends at the right ventricle. B. False B. False The systemic arteries begin as branches of the aorta. A. True A. True The amount of blood that circulates through an organ increases as the organ becomes more metabolically active. A. True B. False Systemic circulation begins at the left ventricle and ends at the right atrium. A. True B. False Hepatic portal circulation enables the liver to store or modify substances in the blood coming from the digestive organs and spleen. A. True A. True The two caval veins drain blood from the body, except for the head. B. False A. True Blood flow slows in capillaries but speeds up in veins. A. A.
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True True Blood in veins is kept moving by external forces as well as constriction of the veins themselves. A. True B. False Question 10 9 out of 10 points Which of the following statements regarding blood pressure are true and which are false? Question Correct Match Selected Match If BP decreases, filtration in the kidneys will increase to compensate. B. False B. False Normal systolic pressure created by the right ventricle is about 120 mmHg.
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