Explanation The major energy source of muscle cells and the only energy source of brain cells are glucose. Therefore, a constant supply of glucose is very important to have a healthy function of the body. Intense, extensive exercise requires a constant supply of glucose into the brain as well as to muscle. When the stored glycogen is depleted in muscle fibers, they are not able to function normally. Stored glycogen in muscle cells is only used in muscle cell function. Glycogen storage of liver would be spent to the function of important tissue metabolisms such as brain cells and heart muscle and red blood cells...

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Question

Chapter 21, Problem 24P

Interpretation Introduction

Interpretation:

Reasons for the exhausting experience in the vigorous exercising process.

Concept introduction:

A continuous functioning of muscle cells may lead to the depletion of stored glycogen and brain cells will experience exhaustion and an inability to normally function due to lack of sufficient glucose substrate supply.

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Chapter 21, Problem 23P

Chapter 21, Problem 25P

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Solution Summary: The author explains that a continuous functioning of muscle cells may lead to the depletion of stored glycogen and brain cells will experience exhaustion and an inability to function due to lack of sufficient glucose substrate supply.

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