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Physics of the Human Body > Muscular System > Flashcards

Flashcards in Muscular System Deck (11)
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1

proprioception

subconscious mechanism by which body is able to regulate posture & movement by responding to stimuli originating in proprioceptors of the joints, tendons, muscles, & inner ear

2

kinesthesis

conscious awareness of position & movement of the body in space

3

proprioceptors

internal receptors located in skin, joints, muscles, & tendons (e.g., muscle spindles and GTOs)

4

eccentric contraction

muscle lengthening under active tension

5

concentric contraction

muscle shortening under active tension

6

motor unit

motor neuron and muscle fibers it innervates

7

all or none principle

individual muscle fibers within a given motor unit will fire and contract either maximally or not at all

8

slow fiber

higher resistance to fatigue, but generally produce less tension than fast fibers

9

fast fiber

produce greater force due to greater shortening velocity, but fatigues faster

10

muscle length-tension relationship

-as length increases, the amount of active tension increases
-as length decreases, the amount of active tension decreases

11

muscle force-velocity relationship

-rate of length change is related to the amount of force potential.
-increase in weight will increase velocity of lengthening
-weight increases, eccentric lengthening increases, concentric lengthening decreases
-weight decreases, eccentric lengthening decreases, concentric lengthening increases