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chapter 6

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.

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  


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Created by: thyhunter