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muscular system
muscular system
20
Nursing
Professional
11/16/2013

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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 disc to the next
Term
origin:
Definition
attachment of a muscle that remains relatively fixed during muscular contraction
Term
insertion:
Definition
the movable attachment of a muscle as opposed to its origin
Term
actin:
Definition
a contractile protein of 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 a bone; fixes the origin of a muscle so that 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 anaerobic 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 exerise
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 control of the will; skeletal muscle
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