1. Skeletal & Muscular Systems (14 min)
The Muscular System
Skeletal & Muscular Systems
(14 min)

2. Your Muscular Body
Your skeletal system provides shape, support, protection and allows movement but CANNOT actually move without the muscular system.
Your muscles are responsible for every move you make.
Blinking, breathing, running and lifting.
Muscle make up about 40% of your body mass.
More than 600 muscles make up the muscular system.

3. Muscle Categories & Types
Two Categories of Muscles:
Involuntary muscles
Not under our conscious control
breathing, heart beating, digestion
Voluntary muscles
Under our conscious control
smiling, bending or standing
Muscle is made up of muscle tissue.
Three kinds:
Skeletal
Smooth
Cardiac

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.
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.

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 - 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. Biceps/Triceps Muscles
Hinge Joint