Muscular System The 600 muscles in the body, both voluntary and

involuntary.

Voluntary muscles are muscles that you can move whenever you want to.

Involuntary muscles contract and relax automatically inside your body. We can not control our involuntary muscles.

Muscle contracts to move bones and body parts.

Muscles look either striated or smooth:

Striated(skeletal) muscle has stripes or striations in it.

Smooth muscle does not.

The Cardiac muscle is unique in the human muscular system because it is made of smooth and skeletal muscle, controls the heart and is involuntary.

http://vilenski.org/science/humanbody/hb_html/internal_organs.htmlhttp://vilenski.org/science/humanbody/hb_html/internal_organs.html

Muscular System

Function:

Controls movement of internal organs such as the stomach, intestine, heart, and circulatory system.

Controls contractions of the heart.

Works with skeletal system to move the body.

Skeletal muscles work in pairs. When one contracts, the other relaxes.

They are attached to bone by bands of tissue called tendons.

Helps circulate blood and move food through the digestive system.

What Muscles Do

• Skeletal muscles

work in pairs to

produce

movement.

Muscular System 600 Muscles

3 types of muscles

Smooth Muscles- Which include the muscles of internal organs

and blood vessels. These muscles move involuntary.

Cardiac Muscle- Found only in the heart and also involuntary.

Skeletal Muscles (striated)- Are voluntary and help you move.

Muscle Movement

Involuntary- Automatically move without you knowing.

Voluntary- Brain sends message to muscle. You control the

movements.

Types Of Muscles

Smooth Muscle- Digestive organs, Makes up 7-8% of your

muscles.

Involuntary

Types of Muscles cont.

Cardiac Muscles- Only found in the heart.

Involuntary.

Makes up 3% of your muscles.

By age 70 heart contracts 2.5 billion times (assume resting heart

beat).

Types of Muscles cont.

Skeletal Muscles- Makes up 90% of your muscles.

Voluntary- These are the muscles that you can move.

Muscle Pairs

Your muscles work in pairs to

move your body. An example of

this is your Bicep and Tricep.