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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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12 years ago
Miguel is a 25-year-old jogger with a target heart rate of 125 bpm. His resting pulse is 70 bpm. His blood volume is approximately 6.8 liters. At rest, his cardiac output is 6.3 liters/min.   
A.   What must his stroke volume be?
B.   What might his EDV and ESV be?
C.    During his workout, his heart rate increases to 125 bpm and his cardiac output to 12,500 mL/min. Do his SV, EDV, and ESV change with exercise?
Textbook 
Human Physiology: An Integrated Approach

Human Physiology: An Integrated Approach


Edition: 8th
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12 years ago
A.   90 mL CO = SV * HR; SV=CO/HR = 6.3L/min/ 70 bpm.
B.   Any combination where EDV minus ESV = 90 mL. Average values are ESV = 44-60 mL, EDV 134-150 mL.
C.   Yes, the SV changes to 100 mL; EDV probably increases proportionately, to 149-167 mL, thus the ESV would be 49-67 mL. One would assume an increase in venous return would lead to atrial stretching and an increased EDV.
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