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30 Cards in this Set
- Front
- Back
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what can muscle do?
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contract.
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when muscle is activated, what happens?
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tends to shorten.
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when muscle contracts, what happens?
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it will do all of its possible actions.
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What indicates what a muscle will do?
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What it can do or could do is no indication of what it will do.
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which are larger, fast twitch or slow twitch fibres?
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fast twitch. Their contraction threshold is higher, but when reached, contraction is faster.
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What are four characteristics of muscle tissue?
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irritability, contractility, extensibility, and elasticity.
(sensitive to stimuli, responds by shortening, can stretch once stimuli subsides, will recoil to original length.) |
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potential of muscle strength based on:
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number of fibres. More fibres = greater strength (also type of fibres).
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what increases thickness, strength, and endurance of muscle fibres?
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exercise.
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characteristic of muscles containing fewer muscle fibres per motor unit
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capable of more precise and delicate action than muscles with many fibres per motor unit (hand vs. leg)
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another name for prime mover
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agonist
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prime mover definition
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muscle whose action is primarily responsible for a particular movement
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antagonist
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muscles on the opposite side of a joint that oppose the action of the agonist.
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example of prime mover versus agonist
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elbow flexion: biceps brachii= agonist. triceps = antagonist.
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muscle working as a fixator
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synergist (assisting/stabilizing) muscle immobilizes a joint or bone. Eg: movement of wrist stopped from moving by forearm muscles during tennis.
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afferent
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signal FROM muscle
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efferent
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signal TO muscle
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sprain
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stretching at joint
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subluxation
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partial dislocation
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proprioception
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self perception as it relates to position, posture, equilibrium, internal function
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gluteus maximus when resistance
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is activated
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gluteus maximus without resistance
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only weakly activated (i.e. during walking...)
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bursa
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small sac of fluid at friction points, esp. joints.
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What are six functional differences between muscle fibre types
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contraction/relaxation time
force produced energy efficiency fatigue resistance elasticity |
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contraction time
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type 1 - slow, type II - fast
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relaxation time
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type 1 - slow, type II - fast
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force produced
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type 1 - lower, type II - higher
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energy efficiency
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type 1 - more, type II - less
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fatigue resistance
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type 1 - greater, type II - less
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elasticity
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type 1 - lower, type II - higher
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how are skeletal muscles named?
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according to shape, location, action, direction, divisions, or attachment.
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