1. Prayer
Attendance
Homework

2. Musculoskeletal System
Muscular System

3. Muscles
Muscle tissue
Bundles of muscle fibers specialized (main function) for contraction.
Muscle fibers are joined together by connective tissue.

4. Types of Muscle Three types of muscle in mammals: Skeletal muscle
Smooth muscle
Cardiac muscle

5. Skeletal Muscle Function: voluntary movement
Skeletal muscle is innervated by the somatic nervous system.

6. Questions Part 3-1

7. Memorize!

8. Name It! A B G D C E F

9. Terms myofibrils Filament of a muscle fiber sarcomere
Contractile unit of myofibrils
sarcoplasmic reticulum
Surrounds myofibrils
Modified (modified) endoplasmic reticulum that stores calcium ions
sarcoplasm
Cytoplasm of a muscle fiber
sarcolemma
Cell membrane of a muscle fiber

10. Sarcolemma & Transverse Tubules
Cell membrane of muscle fiber
Propagates an action potential
Connected to the transverse tubule (T system)
transverse tubule (T system)
channels for ion flow throughout the muscle fibers
Also propagates an action potential

11. Questions Part 3-2

12. Skeletal Muscle Has striations of light and dark bands.
Called striated.

13. Red Fibers vs. White Fibers
Skeletal muscle fibers are red or white.
Red fibers:
Slow twitch fibers
High amount of Myoglobin
many mitochondria
get energy from aerobic respiration
Good for fast activity and activity for a long time

14. Red Fibers vs. White Fibers
Fast twitch fibers
Anaerobic
Has less myoglobin
Has less mitochondria
Get tired more easily
But has greater rate of contraction than red fibers

15. Questions Part 3-3