Term Definition
Contractility shorten with force
excitability responds to a stimulus
Extensibility ability to be stretched
elasticity recoil to resting length after being stretched
epimysium surrounded by connective tissue sheath
Fascia surrounds and separates muscles
fibers single cylindrical cell containing nuclei
endomysium surrounding fiber with connective tissue sheath
myofibrils it extends from one end of the fiber to the other
actin myofilaments thin myofilaments
myosin myofilaments thick myofilaments
sarcomeres are joined end to end form the myofilbril
resting membrane potential charge difference across the memebrane
action potential brief reversal back of the charge
motor nerurons nerve cells that carry action potential to skeletal muscle fibers
neuromuscular junction branch that connects to the muscle forms
synapse near the center of the cell
motor unit all the skeletal fibers it innervates
presynaptic terminal enlarge nerve terminal
synaptic cleft space between the presynatic terminal
postsynaptic terminal muscle fiber
synaptic vesicles each presynaptic terminal contain a synaptic vesicles
acetylcholine secrete a neurotransmitter
acetylcholinesterase cell is rapidly break down by enzymes
sliding filament mechnaism sliding of actin myofilaments past myosin myofilaments during contration
muscle twitch contraction of an entire muscle
threshold muscle fiber will not respond to stimulus
All or none response Phenomenon
Ch.6 – Tyler Bowen

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