Answered: 7. You start running as fast as you…

7. You start running as fast as you can, then you settle into a jog that you can easily maintain. How do energy sources utilized by skeletal muscles change during the switch? Explain why

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter8: Muscle Physiology

Section: Chapter Questions

Problem 11RE

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Concept explainers

Muscle Action

A change in the body or a bodily organ as a result of its functioning is referred to as an action. Muscle action can be defined as the specific movement of a bodily part generated by the contraction of a muscle. The muscle proteins actin and myosin are the important contractile proteins involved in muscle action. Muscle contraction, in addition to movement, serves several other important functions in the body, including posture, heat generation, and joint stability. Muscle contraction maintains posture, which includes standing and sitting.

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7. You start running as fast as you can, then you settle into a jog that you can easily maintain. How do energy sources utilized by skeletal muscles change during the switch? Explain why

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Step 1: Introduction to Energy Sources in Muscle Activity

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Step 2: Energy Systems During High-Intensity Running

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Step 3: Energy Systems During Sustained Jogging

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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?
We control muscle force using motor unit recruitment. When we recruit more motor units, what is happening at the organ/cell/molecular level? more myofibrils within a muscle cell are activated more muscle cells are excited the rate of crossbridge cycling is increased the number of myosin heads bound to actin within a muscle cell is increased more Ca++ is released into the cyoplasm of the muscle cell
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