Term
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Definition
| response of a muscle in response to stimulation |
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Term
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Definition
| contraction of a muscle fiber when stimulated |
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Term
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Definition
| additive effect of several twitches when stimulations are close together |
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Term
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Definition
contractions are so close together
there are only partial relaxations between them |
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Term
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Definition
| contractions are continuous: no time for relaxations between twitches |
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Term
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Definition
| strength of contraction is constant while muscle length shortens (strength stays the same but muscle shortens) |
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Term
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Definition
| strength of contraction increase while muscle length is constant (strength increases while length doesn't change) |
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Term
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Definition
a motor neuron and all the muscle fibers it innervates
when the neurons fires, all of its muscle fibers will twitch
graded contractions of a muscle depend in how many neurons fire |
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Term
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Definition
how many fibers per neuron
varies from muscle depending on degree of one control needed
1:23 would give finer control that 1:1000 |
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Term
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Definition
dark
thick filaments
myosin and over lapping actin
grabs actin and pulls |
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Term
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Definition
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Term
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Definition
central lighter are within a bands
no overlap
thick filaments only |
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Term
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Definition
center of a bands
like a disc with myosin projecting off either side |
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Term
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Definition
in center of i bands
like a disc with actin filaments projecting off either side |
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Term
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Definition
| during contraction, the sacromere shortens and the distance between z lines shortens |
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Term
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Definition
provides information to the CNS feedback about the amount of tension exerted on a tendon
helps prevent damage to muscle or tendon |
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Term
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Definition
| is a maximum rate of O2 consumption |
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Term
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Definition
| is the percentage of the maximum O2 consumption where lactate increases |
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Term
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Definition
| at the end of exercise, HR and RR stay elevated for a period of time in order to payback oxygen debt to myoglobin and hemoglobin |
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Term
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Definition
type I
red fibers
higher concentration in postural muscles
have higher aerobic capacity because they are rich in myoglobin
resistant to fatigue |
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Term
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Definition
type II
white fibers
less myoglobin
better adapted for anaerobic production of ATP |
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Term
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Definition
an inability to maintain tension
during maximal contraction may be due to increase in extracellular K+ interfering with ATP production |
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