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Module four
Skeletal Muscle Terms
20
Anatomy
Undergraduate 1
04/05/2017

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Term
anaerobic
Definition
not requiring oxygen
Term
aerobic
Definition
requiring oxygen to live or grow
Term
sarcomere
Definition
the smallest contractile unit of muscle; extends from one Z tract to the next
Term
origin
Definition
attachment of a muscle that remains relatively fixed during muscle contraction
Term
insertion
Definition
the movable attachment of a muscle as opposed to its origin
Term
actin
Definition
a contractile protein of a muscle
Term
antagonist
Definition
muscle or hormone that acts in opposition to an agonist or prime mover
Term
fixators
Definition
muscles acting to immobilize a joint or bone; fixes the origin of a muscle so that the muscle action can be exerted at the insertion
Term
involuntary
Definition
not under conscious control
Term
isometric
Definition
of the same length
Term
lactic acid
Definition
the product of anerobic metabolism, especially in muscle
Term
latent period
Definition
the time between the stimulation of a muscle and the start of the contraction phase
Term
motor unit
Definition
all of the muscle cells controlled by a single motor neuron
Term
Muscle tone
Definition
sustained partial contraction of a muscle in response to stretch receptor inputs; keeps the muscle healthy and ready to react
Term
muscle twitch
Definition
a single rapid contraction of a muscle followed by relaxation
Term
myosin
Definition
one of the principal contractile proteins found in muscle
Term
oxygen debt
Definition
the volume of oxygen required after exercise to oxidize the lactic acid formed during the exercise
Term
prime mover
Definition
muscle whose contractions are primarily responsible for a particular movement; agonist
Term
relaxation phase
Definition
the period after a contraction when the tension in the muscle fiber returns to resting levels
Term
voluntary muscle
Definition
muscle under the control of the will; skeletal muscle
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