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chapter 6

TermDefinition
contractility the ability to shorten with force
excitability the capacity to respond to stimuli
extensibility the ability to be stretched
epimysium a connective tissue sheath surrounding each skeletal muscle
fascia a connective tissue separating each muscle from another
perimysium loose connective tissue surrounding the fascicle
fiber single muscle cell
endomysium connective tissue sheath surrounding each fiber
myofibrils cytoplasm of each fiber
actin thinner myofilaments
myosin thicker myofilaments
sarcomeres highly ordered units of myofilaments
z line the attachment point for actin
banding the arrangement of actin and myosin
synapse the site where the axon branch connects into the muscle cell
synaptic cleft the space between the presynaptic terminal and muscle cell
acetylcholine neurotransmitter secreted from the synaptic vesicle
acetylcholinesterase the enzyme that breaks down acetylcholine in the muscle cell
threshold the point at which a muscle will react to a stimuli
lag phase the time between the application of the stimulus and the beginning of the contraction
contraction phase the time of contraction
relaxation phase the time during which the muscle relaxes
tetany where the muscle remains contracted without relaxing
anaerobic respiration without oxygen
aerobic respiration with oxygen
muscle fatigue when ATP is used during contraction faster than it can be produced
origin the most 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
synergists muscles that woek together to accomplish a specific movements
antagonists muscles that work in oppisition of each other
intrinsic tongue muscle that change the shape of the tongue
extrinsic tongue muscle that moves the tongue
sternocleidomastoid rotates to head
frontalis raises the eyebrows
masster chewing
depressor anguli oris frowning
levator labil superoris sneering
zygomaticus smiling
kissing muscles buccinator & orbicularis oris
orbicularis oculi colses eyelids
atp energy for muscle contraction
adp degenerated atp
prime mover a muscle that palys a major role in a group of synergist
Created by: thyhunter
 

 



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