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Muscles

muscles

TermDefinition
Contractility The ability of skeletal muscle to shorten with force
Excitability The capacity of skeletal muscle to respond to a stimulus
Extensibility The ability to be stretched
Elasticity ability to recoil to their original resting length
Empimysium Connective tissue sheath surrounding the skeletal muscles
Facia is another connective tissue located outside the epimysium
Fibers faciculi are composed of single muscle cells
Endomysium each fiber is surrounded by loose connective tissue
Myofibrils A thread like structure that extends from one end of the fiber to the other
Actin Myofilaments Thin myofilaments
myosin myofilaments thick myofilaments
sarcomeres are joined end to end
resting membrane potential charge difference across the membrane
action potential brief reversal back to charge
motor neurons a nerve cell that carry action
neuromuscular junction each branch connects to muscle
synapse near the center of the cell
motor unit form a single muscle
presynaptic terminal space between the presynaptic terminal
synaprtic vesicles contains presynaptic terminal
acetylcholine diffuses across synaptic cleft
acetylcholinesterase rapidly broken down by enzymes
sliding filament mechanism sliding of actin myofiliments
muscle twitch contraction of an entire muscle
threshold will not respond to stimulants
all or none response phenomenon
lag phase beginning of contraction
contraction phase time of contraction
relaxation phase time when muscle relaxes
tetany muscle remains contracted
recruitment increase in number of motor units
creatine phosphate can store high energy molecules
anaerobic respiration without oxygen
aerobic respiration with oxygen
oxygen debt amount of oxygen needed for chemical reaction
muscle fatigue used during muscle contraction
isometric length of muscle does not change
isotonic amount of tension produced
Created by: ryansteele