B skeletal muscles C kidneys D gastrointestinal tract E heart and kidneys

B skeletal muscles c kidneys d gastrointestinal tract

This preview shows page 355 - 357 out of 635 pages.

B) skeletal muscles. C) kidneys. D) gastrointestinal tract. E) heart and kidneys. Answer: A 82) The hormone vasopressin acts in the short term to ________ and in the long term to ________, thereby increasing mean arterial pressure. A) vasoconstrict arterioles : decrease urine outflow B) increase urine outflow : vasodilate arterioles C) vasodilate arterioles : increase urine outflow D) vasodilate arterioles : decrease urine outflow E) decrease urine outflow : vasoconstrict arterioles Answer: A 83) Due to their location, baroreceptors in the large systemic veins and the heart function primarily to monitor A) heart rate. B) mean arterial pressure. C) blood flow. D) blood volume. E) total peripheral resistance. Answer: D 84) Which of the following terms is used to label the rhythmic changes in sympathetic and parasympathetic activity that affect heart rate coincident with respiration? A) pulmonary sinus rhythmia B) respiratory sinus rhythmia C) lung sinus rhythmia D) respiratory sinus arrhythmia E) pulmonary sinus arrhythmia Answer: D 14
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85) Despite seeming counterproductive, an increase in arterial carbon dioxide levels activates ________, which causes a(n) ________ in heart rate and a(n) ________ in total peripheral resistance. A) baroreceptors : decrease : decrease B) baroreceptors : increase : increase C) chemoreceptors : decrease : increase D) chemoreceptors: decrease : decrease E) baroreceptors : decrease : increase Answer: D 86) Which of the following will NOT occur as a consequence of the activation of the baroreceptor reflex that would occur in response to an increased heat load within the body? A) an increase in resistance within the skin vasculature B) an increase in stroke volume C) an increase in heart rate D) an increase in venoconstriction E) a decrease in resistance within the skeletal muscle vasculature Answer: A 87) The increase in stroke volume that occurs during exercise is caused primarily by a(n) A) increase in end - diastolic volume. B) increase in myocardial contractility. C) decrease in peripheral resistance. D) increase in venous return. E) decrease in end - systolic volume. Answer: B 88) The increase in blood flow to active skeletal muscle relative to other organs is largely caused by the A) increase in local metabolic factors within the muscle. B) increase in sympathetic activity. C) decrease in metabolic factors within the muscle. D) decrease in parasympathetic activity. E) increase in parasympathetic activity. Answer: A 89) Which of the following accurately describes sympathetic control of blood vessels in the skin during thermoregulation? A) Heat causes an increase in sympathetic activity, resulting in vasodilation. B) Heat causes a decrease in sympathetic activity, resulting in vasoconstriction. C) Heat activates the parasympathetic activity and has no effect on the sympathetic nervous system. D) Heat causes a decrease in sympathetic activity, resulting in vasodilation.
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