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Semester 2 Test Review
Anatomy Mr. Barker Warroad
22
Anatomy
11th Grade
05/26/2011

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Term
origin
Definition
point of attachment, does not move when the muscle contracts
Term
insertion
Definition
point of attachment that moves when muscle contracts
Term
prime mover
Definition
muscle or group of muscles that directly performs a specific movement
Term
anatagonists
Definition
directly oppose agonists
Term
synergists
Definition
facilitate the agonists
Term
excitability
Definition
response to nerve signals
Term
contractility
Definition
ability to contract or shorten
Term
extensibility
Definition
allows muscles to return to their resting length after being contracted
Term
sarcomere
Definition
segment of myofibril between two successive Z lines
Term
sarcoplasmic reticulum
Definition
continualy pumps calcium ions from sarcoplasm and stores them within its sacs
Term
myofilaments
Definition
thousands in each myofibril
Term
myosin
actin
tropomyosin
toponin
Definition
four types of myofilaments
Term
twitch contraction
Definition
single,brief threshold stimulus produces a quick jerk of the muscle
Term
tetanic contractions
Definition
series of stimuli come in rapid enough succession, muscle doesnt have enough time to relax before next stimuli
Term
imcomplete tetanus
Definition
tension is not sustained at a comletely constant level
Term
isotonic contraction
Definition
contraction that tone or tension stay the same
Term
isometric contraction
Definition
muscle length remains teh same but muscle increases
Term
central nervous system
Definition
structual and functional center of the entire nervous system
Term
peripheral nervous system
Definition
nerve tissues that lie in the outer regions of the nervous system
Term
neurons
Definition
conduct impulses
Term
gila
Definition
support functions of neuron
Term
100 billion
Definition
how many nuerons in the human brain
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