1. The Muscular System
The ability to move is an essential activity of the human body
½ our body weight comes from muscles
Consists of over 600 individual muscles.
3 purposes:
Body movement
Body shape
Body heat (maintain temp.)

2. The Muscular System
Body movements are determined by three types of muscles

3. Types of Muscle Can be found in the walls of internal organs.
1. Smooth (involuntary) – cannot be controlled by will.
Can be found in the walls of internal organs.
Organs include: stomach, intestine, bladder, and blood vessels.

4. Types of Muscle
2. Cardiac – control the contractions (pumping) of the heart.

5. Types of Muscle
3. Skeletal (Voluntary) – can be controlled by will.
Muscle connected to bone. Controls parts of the skeleton allowing for movement.

6. Functions of the Muscular System
1. Produce Skeletal Movement: the muscles contract in order to pull on the tendons. The tension causes bones to move.

7. Functions of Muscular System
2. Maintains Posture and Body Position
-This is caused by tension in the muscles.
-In order for this tension to exist, the muscles are in constant activity.

8. Function of the Muscular System
3. Support Soft Tissues
-Vocab: Soft Tissue: Organs
Muscle is a layer of defense for your soft squishy organs. The bones also provide protection.

9. Function of the Muscular System
4. Guards Entrances and Exits of the Body.
-These muscles provide protection and voluntary control for urination and defecation.
(this is why you do not pee yourself)

10. Functions of the Muscular System
5. Maintain Body Temperature.
-When muscles contract they use energy.
This energy releases heat as it is being used.
Maintain Homeostasis

11. Functions of the Muscular System
6. Stores Nutrient Reserves.
-When muscles break down they release amino acids.
These amino acids are tuned into sugar by the liver.