This lesson introduces the anatomy of the muscular system, including the three different muscle tissues. This lesson also describes the role of the muscular system in movement and the physiology of muscle contraction.
The muscular system is responsible for all types of body movement. Additional functions of this system include providing support, stabilizing joints, and generating heat for the body. All muscles consist of specialized cells known as muscle fibers, which contract to facilitate body movement. For the body to move, muscles must be attached to bones. Muscles are also attached to internal organs and blood vessels. Thus, most of the body’s movements occur because of muscle contraction from muscle fibers.
Did You Know?
There are over 600 muscles in the body. Muscles are grouped according to characteristics such as size, shape, and location.
The body is comprised of three types of muscles: cardiac, smooth, and skeletal. As shown in the image below, these muscles look different. They also perform different functions.
Despite the differences among cardiac, smooth, and skeletal muscles, they share four properties: excitability, contractility (muscle shortening), extensibility (muscle stretching), and elasticity.
Skeletal muscles are excited by the nervous system. Cardiac and smooth muscles are stimulated by the nervous system and by circulating hormones.
0 of 1 questions completed
You have already completed the test section before. Hence you can not start it again.
Test Section is loading…
You must sign in or sign up to start the test section.
You must first complete the following:
0 of 1 questions answered correctly
Time has elapsed
You have reached 0 of 0 point(s), (0)
Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)
What is a purpose of the muscular system?