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Chpt 7 Muscular System

TermDefinition
# of muscles in the body 600
muscle makes up how much weight 40%
3 types of muscle skeletal, visceral & cardiac
4 primary characteristics of skeletal muscle excitability, contractility, extensibility & elasticity
excitability respond to stimulus
contractility shorten & contract
extensibility stretch & lengthen
elasticity comes back, recoil, return to original shape
muscle contraction fulfills 4 important functions movement, posture, joint stability & heat production
direct attachment fibers of epimysium fuse w/periosteum of bone
indirect attachment tendon or aponeurosis to attach from muscle to periosteum of bones or connective tissue of other muscles
origin stable or fixed end of muscle
insertion movable side of muscle
motor neurons nerve cell that carries impulses away from the central nervous system toward periphery; special nerve cells that skeletal muscles are stimulated to
acetylcholine neurotransmitter, contained w/in synoptic vesicles in the axon terminal
sarcolemma where receptor sites for acetylcholine are located
muscle tone (tonus) continued state of partial contraction that is present in muscles; helps maintain posture
isotonic same tone/tension; length of muscle changes
isometric same measurement
agonist prime mover
synergist muscle that works w/ or assists prime mover to cause movement
antagonist muscles that oppose or reverse a particular movement
naming muscles usually describes a feature such as size, shape, direction of fibers, location, # of origins, origin & insertion, action
Created by: carriejean11
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