Interactive physiology Muscular system

I. Functions of Skeletal Muscle

A. Movement
B. Posture
C. Generate Heat
D. Stabilize Joints

II. Anatomy of Skeletal Muscle

A. Connective Tissue Coverings: See IP-CD: Muscular System, Skeletal Muscle Anatomy Review.

1. Fascia - fibrous connective tissue which separates individual muscles

2. Epimysium

3. Perimysium

4. Endomysium

5. Fascicle -

6. Tendons -

7. Aponeuroses -

B. Skeletal Muscle Fibers and Microscopic Anatomy: See IP-CD: Muscular System, Skeletal Muscle Anatomy Review.

1. Myofiber (muscle fibers or muscle cells)

2. Sarcolemma

3. Sarcoplasmic reticulum (SR)

4. Terminal cisternae of SR

5. Transverse tubules (T-tubules)

6. Mitochondria

7. Myofibrils

8. Cytosol (Sarcoplasm)

9. Sarcomere

a. Z lines
b. M line
c. A bands
d. I bands
e. H zone

10. Myofilaments

a. Actin

i. Troponin ii. Tropomyosin

b. Myosin

C. Neuromuscular Junction - See IP-CD: Muscular System: Neuromuscular Junction section

1. Motor neuron (axon terminal)

2. Motor end plate of a myofiber (sarcolemma, nuclei & mitochondria)

3. Synaptic cleft

4. Neurotransmitter vesicles and neurotransmitter molecules (ACh)

D. Motor Units - A.D.A.M. Physiology: Contraction of Motor Units p. 3 only

1. Small motor units (fewer myofibers innervated)

2. Large motor units (more myofibers innervated)

III. Skeletal Muscle Physiology: See IP-CD: Sliding Filament Theory.

A. Summary of the Sliding Filament Model of Muscle Contraction

In your own words, write a brief summary of the process of muscle contraction.

1. _____________________________________________________________

2. _____________________________________________________________

3. _____________________________________________________________

4._____________________________________________________________

5. _____________________________________________________________

B. Muscle Relaxation: See A.D.A.M. Interactive