1. The muscular system

2. function Supports the skeleton Aids in movement
Controls vital processes such as breathing and heartbeat

3. 3 Different Muscle Types
Skeletal Muscle
Attaches to and moves bones
Striated (striped) – alternating light and dark bands
Multiple nuclei in each cell
Voluntary-under brain’s conscious control
Example: biceps

4. Smooth muscle
Spindle-shaped cells
One nucleus/cell
No striations
Controls breathing & digestion

5. Cardiac muscle
Striated
Cells smaller than striated muscle
1 or 2 nuclei/cell
Involuntary
Found only in the heart

6. Muscle Fatigue
If oxygen is not available muscle fatigue will set in . Cells will start making energy by Anaerobic Respiration without oxygen.
Lactic Acid accumulates in the skeletal muscles and causes a burning pain in the muscles.
Rest restores the oxygen

8. Muscle function Voluntary muscle
Muscles that contract (move) only when you want them to
Examples: skeletal- biceps, abdominals
Involuntary muscle
Muscles contract (move) on their own
Examples: cardiac, stomach, etc

9. What connects our bones and our muscles???
Tendons
Connects skeletal muscle to bones
Ex. Achilles Tendon – connects gastrocnemius (calf) to heel bone
Ligaments
Connects bone to bone
Ex. ACL – Anterior Cruciate Ligament
connects femur to fibula

11. Malfunctions:
Strain
Overstretching or tearing the muscle or tendon (can be caused by improper lifting)
Sprain
Stretch or tear of ligament (at the joint) resulting from sudden movement (ankle,wrists)
“Pulled hamstring”
Tear in a hamstring muscle

12. Muscles
There are about muscles in your body with some conflicting opinions because what experts consider a muscle.
Smallest muscle in the ear- stapedius
Largest muscle –Gludeus Maximus