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Chapter 6 Anatomy

QuestionAnswer
contractility ability of skeletal muscle to shorten with force
excitability capacity of skeletal muscle to respond to stimulus
extensibility ability to be stretched
elasticity ability to recoil to their original size after being stretched
origin most stationary endo of the muscle
insertion the end of the muscle undergoing the greatest movement
belly portion of the muscle between the origin and the insertion
synergist muscles that work together for specific movements
antagonists muscle that work in opposition to one another
prime mover muscle plays the major role in accomplishing movement
epimysium skeletal muscle surrounded by tissue sheath
fascia connective tissue located outside of epimysiumper
perimysium muscle is
muscle cells muscle fibers
endomysium connective tissue sheath
myofibrils threadlike structure
actin myofilaments strands of pearls twisted together
myosin myofilaments bundles of minute golf balls
sarcomeres actin and myosin myofilaments formed
resting membrane potential charge difference across the membrane
action potential brief reversal back of the charge
motor neurons nerve cells that carry action potentials
neuromuscular junction or synapse branch connects to muscles to form
motor unit single motor neuron and skeletal muscle fibers
presynaptic terminal enlarged nerve terminal
synaptic cleft the space between the presynaptic terminal and the muscle cell
postsynaptic terminal muscle fiber of synaptic cleft
synaptic vesicles presynaptic terminal
acetylcholine neurotransmitter
acetylcholinesterase synaptic cleft between the neuron and muscle cell
sliding filament mechanism myofilaments during contraction
muscle twitch contraction of an entire muscle response to a stimuli
threshold a level stimuli reaches
all-or-none muscle fiber contract maximally
lag phase beginning of contraction
contraction phase time of contraction
relaxation phase time during which muscle relaxes
tetany muscle remains contracted without relaxing
recruitment increase in number of motor units being activated
ATP needed for energy for muscle contraction
ATP produced in the mitochondria
ATP short lived and unstable
ADP plus phosphate
creatine phosphate high energy molecule
anaerobic respiration without oxygen
aerobic respiration with oxygen
oxygen debt amount of oxygen needed in chemical reactions to convert lactic acid
muscle fatigue when ATP is used during contraction
isometric equal distance
isotonic equal tension
muscle tone muscle tone refers to constant tension
fast twitch fibers contract quickly and fatigue
slow twitch fibers contract more slowly and are more resistant to fatigue
origin stationary end of the muscle
insertion the end of the muscle undergoing the greatest movement
belly portion of the muscle between the origin and the insertion
synerigsts muscles that work together to accomplish specific movement
antagonist muscle that works in opposition to one another
sliding filament mechanism myofilaments during contraction
muscle twitch contraction of an entire muscle response to a stimuli
threshold a level stimuli reaches
all-or-none muscle fiber contract maximally
lag phase beginning of contraction
contraction phase time of contraction
relaxation phase time during which muscle relaxes
tetany muscle remains contracted without relaxing
recruitment increase in number of motor units being activated
muscles that work opposite of eachother antagonists
anaerobic respiration produces lactic acid within the muscle
a muscle fiber is surrounded by the endomysium
a muscle is composed of numerous bundles called fasculi
slow twitch muscle fibers fatigue quickly
fast twitch muscle fibers fatigue quickly
tongue muscles intrinsic and extrensic
orbicular oculi closes eyelid
not a characteristic of skeletal muscle reversibility
muscle twitch a contraction of an entire muscle in response to stimuli
Created by: mdlemon1
 

 



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