Term
3 general types of muscles |
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Definition
smooth, cardiac, skeletal |
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Term
what makes up myofibrils (2) |
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Definition
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Term
what makes up muscle fibers |
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Definition
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Term
after fibres, what is the next largest level of muscle organization |
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Definition
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Term
what is the largest level of muscle organizaiton |
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Definition
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Term
a typical muscle is controlled by about a hundred large motor neurons whose cell bodies lie in a distinct cluster called what |
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Definition
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Term
a typical muscle is controlled by about a hundred large motor neurons whose cell bodies lie in a distinct cluster called a motor nucleus located in what |
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Definition
spinal cord or brain stem |
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Term
each muscle fiber is normally innervated by only one motor neuron in only one place, usually near the midpoint, except |
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Definition
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Term
ensemble of muscle fibers innervated by a single motor neuron |
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Definition
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Term
ensemble of muscle fibers innervated by a single motor neuron together with its motor neuron is called what |
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Definition
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Term
functional connection between a motor neuron and a target muscle fiber is a chemical synapse called what |
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Definition
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Term
the neuromuscular synapse formed by a motor neuron on a muscle fiber is large and filled with many vesicles containing what |
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Definition
neurotransmitter acetylcholine |
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Term
acetylcholine released from the presynaptic terminal is rapidly hyrdolyzed by what |
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Definition
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Term
acetycholine being rapidly hydrolyzed ACHase results in what |
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Definition
muscle fiber is ready to respond again in an all or none manner to the action potention |
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Term
once the postsynaptic membrane of the neuromuscular junction is depolarized to threshold an action potential propagates along the membrane of the muscle fiber, what is this membrane called |
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Definition
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Term
most mammalian muscles are composed of a a mix of 3 types of muscle fibers what are they |
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Definition
slow twitch (type I), fast-twitch fatigue resistant (type IIa), fast-twitch fatigable (type IIB) |
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Term
red muscles are composed mostly of what muscle fibers |
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Definition
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Term
describe the force produced by type I fibers in response to an action potential |
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Definition
rises and falls relatively slowly |
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Term
type I muscle fibers use what energy mechanism |
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Definition
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Term
why do individual red muscle fibers produce less contractile force than fast-twitch fibers |
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Definition
red muscle fibers have fewer contractile filaments |
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Term
white muscles are composed of what fibers |
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Definition
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Term
type ii fibers rely on what to sustain force output |
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Definition
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Term
type ii fibers have large stores off what that provide energy |
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Definition
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Term
which motor neuron has large cell bodies and large diameter axons. those that supply type I or type II |
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Definition
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Term
in both reflexive and voluntary contractions how are motor units recruited? |
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Definition
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Term
sized ordered recruitment serves two important purposes what are they |
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Definition
energy conservation, matching force production with force required |
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