1. Skeletal & Muscular Systems - video
The Muscular System
Skeletal & Muscular Systems - video

2. Your Muscular Body
Your muscles are responsible for every move you make:
Blinking, breathing, running and lifting.
Muscle make up about 40% of your body mass.

3. Muscle Types Two Kinds: Muscle is make up of muscle tissue.
Involuntary muscles
Not under our conscious control (breathing, heart beating, digestion)
Voluntary muscles
Under our conscious control (smiling, bending or standing)
Muscle is make up of muscle tissue.
Three kinds: Skeletal, Smooth, and Cardiac
Each type is specialized to perform a different function in the body.

4. Muscle Types Skeletal Muscle (Striated)
Attached to the bones of your skeleton by tendons used for movement.
Pulls on bones to make the body move.
Voluntary – you control them.
Made up of long, thin cells that each contain more than one nucleus.
Biceps, triceps, and quadriceps.

5. Skeletal Muscle
Muscle Fibers
Nucleus
Striations

6. Muscle Types 2. Smooth Muscle
Located in the internal organs of the body:
Stomach, intestines, kidney, and liver.
Movement of food through the digestive system
Movement of blood through blood vessels
Involuntary – you don’t control them.
Made up of spindle-shaped cells that contain only one nucleus.

7. Smooth Muscle
Smooth Muscle
Fiber
Nucleus

8. Muscle Types Cardiac Muscle Found ONLY in the heart!
Has characteristics in common with both smooth and skeletal muscle:
Like smooth, it’s involuntary – no control
Like skeletal, it’s striated

9. Cardiac Muscle
Nucleus
Cardiac
Muscle Fibers
Striations

10. Muscles and Movement Skeletal muscles are held to bone by tendons.
Tendons allow the muscles to pull on the bones and move the body.
The pull of a muscle on a bone is called a contraction.
This causes the muscle to get thicker and shorter.
Because muscles can ONLY contract they must work in pairs to complete an opposite movement, relax.
Simulation – bicep/tricep

11. Triceps Muscle - Contraction/Relaxation
Hinge Joint