Chapter 4 – Muscular Strength and Endurance


  1. Describe muscular structure and function
  2. Identify types of muscles
  3. Describe an effective resistance exercise program
  4. Assess your muscular strength and endurance
  5. Understand the dangers of supplements


  • Muscles– organ in the body that causes movement
  • Skeletal Muscle– Responsible for body movement
  • Cardiac MuscleResponsible for the contraction of the heart
  • Muscle Fiber– individual muscle cell
  • Motor unit– a nerve controlling a group of muscle fibers
  • Myofibrils- threadlike structures running the length of the muscle fiber
  • Insertion– point where the muscle is attached to a bone that moves
  • Origin– point where the muscle is attached to a bone that remains in a fixed position
  • Action Potential– the electrical current that cause a muscle to contract
  • Sliding Filament Theory– the theory of how our muscles move
  • Dynamic contraction– muscle movements that cause bodily movements
  • Repetition– One movement pattern
  • Set– a group of repetitions
  • Periodization– Breaking resistance training into different training phases
  • Strength– the maximal amount a force that can produced one time
  • Hypertrophy– muscle fibers getting bigger
  • Atrophy– muscle fibers getting smaller
  • Isokinetic– muscle is contracted at a constant tempo
  • Isometric– muscle contraction that causes no change in muscle length/no bodily movement


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Health and Fitness for Life Copyright © 2019 by Dawn Markell and Diane Peterson is licensed under a Creative Commons Attribution 4.0 International License, except where otherwise noted.

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