2. The Muscular System There’s more to it than you think!

3. Components 1. Muscles -made of fibers in bands… includes voluntary muscles and involuntary muscles, as well as cardiac 1. Muscles -made of fibers in bands… includes voluntary muscles and involuntary muscles, as well as cardiac Voluntary-skeletal muscles, striated, you control them, move the body Voluntary-skeletal muscles, striated, you control them, move the body Involuntary-organ muscles, smooth, you don’t control them (diaphragm, uterus, bladder) Involuntary-organ muscles, smooth, you don’t control them (diaphragm, uterus, bladder) Cardiac - heart, compination of smooth and striated, involuntary Cardiac - heart, compination of smooth and striated, involuntary

4. How a muscle works: Two types of fibers, one grips the other. To start the gripping/contracting process, calcium attaches to ions, expose the fibers and start the contraction. Then the calcium releases the ion, and the contraction stops, releasing the muscle.

5. Interesting Facts Why muscles cramp Not enough water, therefore body can’t control heat generated by contractions, slow down, or stop Not enough calcium or other minerals and the for the cycle is interrupted Overuse and the muscle fatigues