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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1999. Scientific American. How do muscle cells respond to exercise by becoming stronger and thicker? Transcription of muscle proteins affected by large number of factors (sex hormones, thyroid hormones, growth factors, etc.). Example: anabolic steroids (synthetic version of testosterone) combine with transcription factors to turn on genes and make more muscle proteins. [side effects include high
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