1. Muscular System Muscle-an organ that contracts and gets shorter- this provides the force to move your body parts. Muscle-an organ that contracts and gets shorter- this provides the force to move your body parts.

2. Function of Muscles Produce movement Produce movement Maintain posture Maintain posture Stabilize joints Stabilize joints Generate heat Generate heat

3. Muscle Control Voluntary muscles- muscles that you are able to control. Ex (leg and arm muscles) Voluntary muscles- muscles that you are able to control. Ex (leg and arm muscles) Involuntary Muscles- you can not move them consciously. They just keep working Involuntary Muscles- you can not move them consciously. They just keep working Examples- heart

4. The Muscular System Three basic muscle types are found in the body: 1.Skeletal muscle 2.Cardiac muscle 3.Smooth muscle

5. Muscle Types

6. Cardiac Muscle found only in heart Has characteristics of skeletal muscle ( striated) Has characteristics of skeletal muscle ( striated) Has characteristics of smooth muscle (involuntary) Has characteristics of smooth muscle (involuntary)

7. Skeletal Muscle Most are attached by tendons to bones Most are attached by tendons to bones Muscles PULL on bones (never push) Muscles PULL on bones (never push) Voluntary Voluntary

8. GROSS ALERT!!!! The following picture is of real human muscle tissue during a surgical procedure- NOT FOR THE SQUEAMISH !!!

10. Smooth Muscle Inside the esophagus, stomach, intestines, bronchi, uterus, urethra, bladder, and blood vessels Inside the esophagus, stomach, intestines, bronchi, uterus, urethra, bladder, and blood vessels Shorter fibers than skeletal muscle Shorter fibers than skeletal muscle Involuntary Involuntary

11. Muscle Facts Muscle cells are called fibers Muscle cells are called fibers Muscles are powered by the oxidation of fats and carbohydrates Muscles are powered by the oxidation of fats and carbohydrates These chemical reactions produce ATP (adenosine triphosphate) These chemical reactions produce ATP (adenosine triphosphate) The term muscle is derived from the Latin musculus meaning "little mouse" perhaps because of the shape of certain muscles or because contracting muscles look like mice moving under the skin. The term muscle is derived from the Latin musculus meaning "little mouse" perhaps because of the shape of certain muscles or because contracting muscles look like mice moving under the skin.