Ch 7: Muscular System Functions

About This Chapter

Use the engaging video lessons in this chapter to brush up on the major muscular system functions. Videos teach you about the neuromuscular junction, muscle fiber types and more.

Muscular System Functions - Chapter Summary

You'll examine muscle tissue types and functions, muscle twitch, muscle tension and wave summation in this chapter. You can examine skeletal muscle fibers and their functions. Other lessons cover excitation-contraction coupling, muscle metabolism and muscular contraction regulation for your review. By the time you complete the chapter, you will be familiar with the following topics:

  • Skeletal muscle's length-tension relationship
  • The sarcomere and sliding filaments in muscular contraction
  • Muscular contraction and cross-bridge formation
  • Isometric and isotonic contraction
  • Motor unit summation
  • The synthesis of ATP
  • Connective tissue layers

Our professional instructors take you through the fun video lessons using engaging narration and illustrations to give you a thorough, effective review. The convenient video tags let you jump to major segments in no time. Top off each of the lessons with a handy practice quiz to verify your understanding.

13 Lessons in Chapter 7: Muscular System Functions
Test your knowledge with a 30-question chapter practice test
Types of Muscle Tissue: Skeletal, Cardiac & Smooth

1. Types of Muscle Tissue: Skeletal, Cardiac & Smooth

Have you ever wondered why muscle has different names such as striated, smooth, voluntary, or involuntary? This lesson describes the different types of muscle tissue based on their histology, mechanism of contraction, and regulation.

Major Skeletal Muscle Functions

2. Major Skeletal Muscle Functions

Did you know that skeletal muscle does more than just move our body parts? This lesson describes how skeletal muscles are used for movement, posture, swallowing, defecation, urination and homeostasis.

Skeletal Muscle Organization: Connective Tissue and Layers

3. Skeletal Muscle Organization: Connective Tissue and Layers

Did you know that skeletal muscles are organized into tightly packed groups? This lesson identifies the connective tissue layers that organize skeletal muscle into fascicles, muscle fibers and myofibrils. Additionally, the microscopic structure of the sarcomere is described.

The Sarcomere and Sliding Filaments in Muscular Contraction: Definition and Structures

4. The Sarcomere and Sliding Filaments in Muscular Contraction: Definition and Structures

Did you know that a sarcomere is the fundamental functional unit of striated muscle? This lesson describes the thick and thin filaments of a sarcomere and how they interact with each other to cause sarcomere shortening and muscular contraction.

Muscular Contraction: Cross-Bridge Formation

5. Muscular Contraction: Cross-Bridge Formation

Did you know that muscles contract as a result of cross-bridge formation between actin and myosin? This lesson describes the stages of cross-bridge cycling and how this results in sarcomere shortening and muscular contraction.

Excitation-Contraction Coupling & Muscular Contraction Regulation

6. Excitation-Contraction Coupling & Muscular Contraction Regulation

Did you know that calcium couples neural stimulation with contraction of skeletal muscle? This lesson describes the role of calcium, troponin, tropomyosin, and ATP in the regulation of muscular contraction. Rigor mortis is explained to help you understand the regulation of contraction as well.

The Neuromuscular Junction: Function, Structure & Physiology

7. The Neuromuscular Junction: Function, Structure & Physiology

A neuromuscular junction is a synapse between a motor neuron and skeletal muscle. This lesson describes the events of synaptic transmission leading to contraction of skeletal muscle. Myasthenia gravis is described as a neuromuscular disease.

Length-Tension Relationship in Skeletal Muscle

8. Length-Tension Relationship in Skeletal Muscle

All skeletal muscles have a resting length. When our muscles are stretched to the ideal length, it can maximize muscular contraction. This lesson explains the length-tension relationship in skeletal muscle and explores how the arrangement of myofilaments in a sarcomere can impact tension and contraction.

Muscle Twitch, Wave Summation & Muscle Tension

9. Muscle Twitch, Wave Summation & Muscle Tension

Did you know that posture results from rapid stimulation of skeletal muscles? This lesson describes the nature of a muscle twitch and explains how individual contractions are added together resulting in tetanus and good posture.

How Motor Unit Summation Develops Muscle Tension

10. How Motor Unit Summation Develops Muscle Tension

Did you know that skeletal muscles are composed of motor units? This lesson describes the nature of a motor unit and how motor unit recruitment regulates whole muscle contraction. Additionally, this lesson describes the effect of strength conditioning on muscle.

Isometric and Isotonic Contraction: Definition and Examples

11. Isometric and Isotonic Contraction: Definition and Examples

Did you know that muscles can contract and not move your limbs? This lesson describes the nature of both isometric and isotonic skeletal muscle contraction. Examples are utilized to help you understand how this works.

Muscle Metabolism: Synthesis of ATP

12. Muscle Metabolism: Synthesis of ATP

Did you know our muscles use billions of molecules every second to contract? This lesson describes the different metabolic processes by which ATP is generated by the muscle cell. Examples are utilized to define glycolysis, the citric acid cycle and oxidative phosphorylation.

Skeletal Muscle Fibers: Types and Functions

13. Skeletal Muscle Fibers: Types and Functions

Did you know most human muscles contain a mixture of fast, slow and intermediate fibers? This lesson describes the structure and function of the three muscle fiber types found in humans.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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