Muscular System

Muscular System

Author: Aaron Mullally

This lesson will introduce the structure and function of the bodies muscular system including the three types of muscle.

See More
Try a College Course Free

Sophia’s self-paced online courses are a great way to save time and money as you earn credits eligible for transfer to over 2,000 colleges and universities.*

Begin Free Trial
No credit card required

25 Sophia partners guarantee credit transfer.

221 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 20 of Sophia’s online courses. More than 2,000 colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.


Intro to Muscle

Source: Skeletal Muscle image, Creative Commons: http://bit.ly/TuVK6Y Cardiac Muscle Image; Creative Commons: http://bit.ly/dD7ryY Smooth Muscle Image; Creative Commons: http://bit.ly/UyndJt

  • Involuntary muscle

    Muscle that we have no conscious control of; cardiac and smooth muscle are in this category.

  • Voluntary muscle

    Muscle that we have conscious control of; skeletal muscle is the only one of the three.

  • Smooth muscle

    ​A form of muscle that contains short, tube-like (fusiform) single nucleated cells; smooth muscle range from having many layers to a single layer of cells; smooth muscle is found in the walls of hollow organs.

  • Cardiac muscle

    ​A form of muscle that contains short, branched, striated single nucleated cells; cardiac muscle is only located in the heart and is used to pump blood throughout the cardiovascular system.

  • Skeletal muscle

    ​A form of muscle that contains very long, striated, multinucleated cells; skeletal muscles are the largest form of muscles in the body and attached to the skeleton; these are used for the movement of our bones, generate heat and protect deeper internal organs.

  • Muscular system

    ​One of the eleven organ systems of the human body; contains three different types of histologically different forms of muscle (smooth, cardiac, skeletal) that are found in different areas of the body but all share the same primary function and movement.