Exercise Physiology: Theory and Application to Fitness and Performance
Exercise Physiology: Theory and Application to Fitness and Performance
9th Edition
ISBN: 9780073523538
Author: Scott K Powers, Edward T Howley
Publisher: McGraw-Hill Education
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Chapter 8, Problem 1O
Summary Introduction

To draw: The microstructure of a skeletal muscle fiber.

Introduction: There are three types of muscle tissue cells in the body. they are cardiac muscle cells, skeletal muscle cells and smooth cells.

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Answer to Problem 1O

Pictorial representation: Fig.1 represents the microstructure of a skeletal muscle fiber.

Exercise Physiology: Theory and Application to Fitness and Performance, Chapter 8, Problem 1O

Fig.1: Microstructure of a skeletal muscle fiber

Explanation of Solution

A skeletal muscle fiber is a thin, elongated cylinder and is surrounded by a cell membrane called as sarcolemma. The satellite cells are the muscle precursor cells located above the sarcolemma and below the basal lamina. The myofibrils are the threadlike strands within the muscle fibers. Actin is a thin filament and myosin is the thick filament of myofibrils. The sarcomere includes the Z-line, H-line, M-line, I-band, and A-band. Sarcoplasmic reticulum serves as a storage site for calcium.

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