When a person engages in strenuous, prolonged exercise, a. blood flow to the kidneys is reduced.b. cardiac output is reduced.c. total peripheral resistance increases.d. systolic arterial blood pressure is reduced.e. blood flow to the brain is reduced.
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When a person engages in strenuous, prolonged exercise,
a. blood flow to the kidneys is reduced.
b. cardiac output is reduced.
c. total peripheral resistance increases.
d. systolic arterial blood pressure is reduced.
e. blood flow to the brain is reduced.
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- It is generally accepted that a relatively low diastolic vascular pressure is more important than a relatively low systolic vascular pressure because: A. diastolic vascular pressure is the pressure that determines the length of diastole. B. diastolic vascular pressure directly determines stroke volume. C. diastolic vascular pressure ultimately determines and controls contractility. D. diastolic vascular pressure is a force the heart must compete with to open the aortic valve. E. None of the above is correct.The delivery of blood by the left ventricle into the sorta is intermittent, whereas blood flow in the peripheral circulation is usually continuous. Which of the following best explains this difference? A. Arteries contain more elastic tissue than veins . B Capillary walls contain little elastic or muscular tissue . C. Continuous flow is needed to meet metabolic requirements. D. Passive recoil of the arteries delivers blood to the periphery during diastole E . Rhythmic contractions of arterial smooth muscie increase the diastolic pressure to above zeroWhich of the following tissues/organs would experience an increase in blood flow from transition from rest to exercise? a. Skeletal muscle b. Heart c. Kidneys d. The brain e. Skin
- Which of the following is true of propagation of longitudinal electrical flow in cardiac muscle. A. Current flows longitudinally from a region of depolarization through ryanodine receptors. B. Longitudinal current flows through inward rectifier potassium channels. C. This current can be detected at the body surface, if the source is large enough. D. A and B. E. All are true.It is generally accepted that a relatively low diastolic vascular pressure is more important than a relatively low systolic vascular pressure because: A. diastolic vascular pressure is the pressure that determines the length of diastole. B. diastolic vascular pressure directly determines stroke volume. C. diastolic vascular pressure ultimately determines and controls contractility. D. diastolic vascular pressure is a force the heart must compete with to open the aortic valve.During exercise, the blood flow through skeletal muscle may increaseup to 20-fold. However, the cardiac output does not increase thatmuch. This occurs because ofa. vasoconstriction in the viscera.b. vasoconstriction in the skin (at least temporarily).c. vasodilation of skeletal muscle blood vessels.d. Both a and b are correct.e. All of these are correct.
- Which of the following statements is true? a. The longer the vessel, the lower the resistance and the greater the flow. b. As blood volume decreases, blood pressure and blood flow also decrease. O c. Increased viscosity increases blood flow. d. All of the above are true What effect does fascicle arrangement have on a muscle's action? a. left atrium O b. left ventricle c. right atrium O d. right ventricleWhich cell types are associated with spontaneous action potential generation in the absence of an external stimulus from other tissues. A. Sino-Atrial node cells (SA node). B. Atrial cells C. Ventricular cells. D. Endothelial cells. E. A and D.During the ventricular ejection phase of the normal human cardiac cycle, one option is correct: a. ejection takes less time than filling, in a resting human. b. the left ventricle diameter increases and the ventricle elongates from base to apex. c. papillary muscles close the atrioventricular valves. d. the chordae tendineae are relaxed. e. the apex beat is best felt in the anterior axillary line, fifth intercostal space.
- A patient has been in a serious car accident and is hemorrhaging. Which of the following changes would be seen in this patient? a. a decrease in stroke volume b. an increase in heart rate c. a possible decrease in cardiac output d. All of these are correct.a calcium channel blocker or an antagonist drug will produce a. vasoconstriction b. increase in blood pressure c. increase in total peripheral resistance d. reduction in cardiac muscle contractilityContraction of the smooth muscle layers of the arterioles a. increases the frictional resistance to blood flow. b. may be a way of increasing heat exchange through the skin. c. can increase blood flow to an organ. d. All of the choices are correct.