Human Biology Custom Edition
Human Biology Custom Edition
11th Edition
ISBN: 9781337631532
Author: Cecie Starr, Beverly McMillan
Publisher: Cengage Learning
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Chapter 6, Problem 4CT

At the gym Sean gets on a stair-climbing machine and “climbs” as fast as he can for fifteen minutes. At the end of that time he is breathing hard and his quadriceps and other leg muscles are aching. What is the physiological explanation for these Symptoms?

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You are at the gym and doing strength training. You feel in good shape and should try to break personal records in squats. You place the bar on your back and begin to take in, that is, your motor neurons begin to send action potentials through all your motor units to the thigh muscles.   What is the contraction called when you a) bend down and b) are in good shape and can generate more force than the bar weighs c) stay standing in one and the same position without being able to push yourself up in a standing position?
Most immediate physiological adjustments to exercise occur prior to any change in tissue metabolic demand for oxygen or nutrients.  This occurs because exercise increases sympathetic nervous system activity.  With your knowledge of exercise and the control of alpha motor neurons by the primary motor cortex of the brain, how does increased exercise influence the sympathetic nervous system?
Discuss the similarities and differences by which Ca2+ activity is involved in initiating muscle contraction in skeletal versus smooth muscle fibers (hint: include Ca2+ sources, proteins it binds to, and signaling cascade it activates leading to contraction). (max 12 sentences)
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KINE 2310-Chapter 4: Philosophy of Physical Activity; Author: HBU Online Course Development;https://www.youtube.com/watch?v=8Ky6t3nvP_4;License: Standard youtube license