Muscular System Flashcards Preview

HAP1 Mid Sem - LO3 - Proccesses > Muscular System > Flashcards

Flashcards in Muscular System Deck (9)
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1

Motor Unit

A motor neuron and all of the muscle fibers it innervates

2

Short muscle length

Actin - Actin overlap
Number of cross bridges reduced

3

Long muscle length

Myosin - Actin overlap
Number of cross bridges reduced

4

Optimal muscle length

Actin - myosin overlap
Number of cross bridges at maximum number

5

Dynamic (Isotonic!!) contractions

Concentric and Eccentric

6

Concentric contraction

Force develops as the muscle shortens

7

Eccentric contraction

Force develops as the muscle lengthens

8

Isometric (Static!!) contractions

Force in the muscle increases whilst the muscle cannot shorten

9

Neuromuscular Junction - 5 steps

1. ACh attaches to receptors on sarcolemma
2. Action potential generated
3. Action potential travels along sarcolemma
4. Arrives at axon terminal
5. ACh released