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HPHY 371 Final Exam Latest Update @
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HPHY 371 Final Exam Latest Update @ 2024 -2025 Of the factors that can influence stroke volume, which do you t hink contributes to the rise in stroke volume during exercise? Increased afterload Increased contractility Increased heart rate All of the above - Answer increased Contractility Based on the Krogh hydraulic model, which of the following would i ncrease preload during exercise? Vasodilation of skin blood vessels Vasodilation of splanchnic blood vessels Vasodilation of skeletal muscle blood vessels None of the above - Answer None of the above **vasoconstriction to non-active muscles is what increases prel oad during exercise If you are 20 years old, what is your estimated maximal heart rate? 180 200 220 240 - Answer 200 **220-age=max HR Which of the following variables are NOT included within the term s of the Fick equation? Arterial O2 content Mixed venous O2 content Heart rate Arterial pressure - Answer Arterial pressure **Fick EQ: Vo2 = HR * SV *(a-v O2 diff) Which of the following are TRUE about the mixed venous oxygen cont ent? It becomes greater with increasing exercise intensity It is greater than femoral venous oxygen content It is measured from a venous blood sample from the antecubital vein in your arm All of the above - Answer It is greater than femoral venous oxygen content During exercise, blood flow will decrease to which of the following tiss ues/organs? Brain Heart Kidneys None of the above - Answer Kidneys What are the three cardiovascular adjustments that must occur in re sponse to exercise. - Answer 1. increase in sympathetic nervous system activity 2. increase in venous return (preload) in proportion to CO 3. redistribution of cardiac output Which of the following factors contribute(s) to the rise in str oke volume during whole-body rhythmic exercise? a. An increase in cardiac contractility that is caused by the inc rease in activity of cardiac sympathetic nerves b. The Frank-Starling mechanism (vasoconstriction) c. An increase in heart rate d. Both a and b e. All of the above - Answer d. Both a and b **not c because an increase in HR might initially raise SV, but will eve ntually cause a drop in bp which will ultimately decrease SV Exercise hyperpnea refers to which of the following? a. A linear rise in ventilation in proportion to the rise in blood lactate b. A linear increase in ventilation that is proportional to the incr ease in metabolismThe benefits of buying summaries with Stuvia:
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