The muscular system is the body system responsible for movement. The muscles are attached to bones and make up important organs, like the heart, digestive organs and blood vessels.

How Muscles Move: Skeletal muscles move through a process called contraction. Muscle fibers, which stretch from one end to another across a muscle, will contract, or shorten. As this …

Explore antagonistic muscles. Learn the definition of an antagonist muscle and understand how it differs from an agonist muscle. See examples of...

In this lesson you will find basic background on the muscle system and skeletal system as well as how they work collaboratively to perform the important function of human movement.

What happens when a muscle contracts? Learn about the muscle contraction process and the role of the proteins actin and myosin in muscle contraction, as well as the types of muscle …

Learn about antagonistic muscles in our engaging video. Learn how these muscles work in pairs to create movement and stability in the body, followed by a quiz.

In this lesson you will find basic background on the muscle system and skeletal system as well as how they work collaboratively to perform the important function of human movement.

What is the function of the internal and external intercostal muscles? The internal intercostal muscles contract and compress the thoracic cavity, which helps expel air out during forced …

In this lesson we'll explain the mechanism of action of anabolic steroids. We'll go over how they alter your cells to cause changes like increased muscle growth, and some of the main reasons ...

Antagonistic Pairs in Skeletal Muscles Two articulating bones usually do not equally move in response to a muscle contraction. One bone will remain stationary or near the original position …