Muscle I (WS 15)

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1

Nervous Muscular Junction (NMJ)

acetylcholine receptors

nervous signal transfers to muscle at "motor end plate region"

2

Muscle characteristics

1. Excitability (irritability)
2. Contractibility
capable of contraction (becoming shorter)
3. Extensibility
stretching (is limited)
4. Elasticity
contracting against stretch

3

Muscle Types

1. Skeletal muscle
2. Cardiac muscle
3. Smooth muscle

4

Skeletal Muscle

Muscle fiber
Is a single muscle cell
Replacement occurs via satellite cells
Fibers are large

Multinucleate cells- hundreds
Myofibrils contain contractile and elastic elements
Have striations, sarcomeres, and voluntary contractions

5

Cardiac Muscle

Striations, spontaneous contractions, and hormone based
Fibers are small
Has striations- smaller than skeletal muscle
branched and uninucleate
Intercalated Discs- junctions that are joined by cells in series

6

Smooth Muscle

Fibers are small
Lacks striations
No sarcomeres
uninucleate (spindle shaped fibers)
No t-tubules
Slowest
Spontaneous contractions and hormone based