lecture27nth - cause of proportion shift Cardiovascular...

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Figure 25-7 Cardiovascular response to exercise ± CO >4x ± proportion >4x ± blood (liters/min) to skeletal muscles ~20x cause of proportion shift: vasodilation in skeletal muscles vasoconstriction elsewhere
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Limitations to athletic performance oxygen delivery to muscles by blood oxygen delivery to blood by lungs oxygen use by muscle cells force production by muscle cells ventilation reaches 65% of max. when cardiac output reaches 90% of max (so cardio system sets limit before ventilation system)
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