The Muscular System

By Jessica Mu

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The Muscles

Functions of each Organ in the Muscular System

There are three organs in the muscular stem. They each perform a function for our body system.
  • Skeletal Muscles- These muscles are voluntary, meaning you control them. The skeletal muscles produce all the movements of your body parts.
  • Smooth Muscles- These muscles are involuntary, meaning you don't control them. They line the walls of your stomach, intestines, and other hollow tubes. They slowly contract and use less energy than skeletal muscles. As the muscles contract, they help move food through your digestive system.
  • Cardiac Muscle- These muscles are also involuntary and they make up the heart. They continuously contract and relax, pumping blood around our body sixty to seventy times a minute. Cardiac Muscles never tire.
4 Functions the Muscular System performs for our body.
  • It moves food through our digestive system
  • It pumps and circulates our blood.
  • It controls our movements. (Smile, nod, laugh, run, walk, eat, etc.)
  • Muscles fuel our actions

Voluntary Muscles

The skeletal muscles are voluntary muscles. They are the most common kind of the three types of muscles in our body. Skeletal muscles are in vertebrae so if you don't have a vertebrae, you don't have skeletal muscles. Skeletal muscles are striated (long, thin, with a pattern of red and white lines) and are bound together by connective tissue. Skeletal muscles communicate with our nerves and blood vessels.
Skeletal Muscles....
  • Help us with movement and posture
  • Help us balance
  • Constitutes the bulk of our muscle tissues
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Muscular System Diseases: Myasthenia Gravis

Myasthenia gravis is a chronic autoimmune disorder, which is when the immune system reacts against the body's own ordinary components. Myasthenia gravis can occur at any age and it affects the muscles of our face, neck, throat, and limbs. This disease results from the autoimmune disorder, making the body produce auto-antibodies that attack receptors floating on the surface of our muscle cells. Then it prevents the muscles from responding to our nerve signals. Treatments for myasthenia gravis include anticholinesterase medications that stimulate the transmission of nerve impulses which dampen the immune response.

Could a Person Live Without the Muscular System?

No, a person could not live without the muscular system. It helps pump our blood and it allows us to make movement. Without the muscular system, you wouldn't be able to move.

Muscular System Interacing With Other Systems

  • The muscular system interacts with the digestive system when the smooth muscles help move food through the digestive system
  • The muscular system interacts with the circulatory system when the cardiac muscles make up the heart and help pump blood
  • The skeletal muscles touch and interact with the skeletal system
  • The muscular system receives signals from the nervous system

By Jessica Mu