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eastham anatomy

period 1

QuestionAnswer
Contractility ability of skeletal muscle to shorten with force.
Excitability capacity of skeletal muscle to respond to a stimulus.
Extensibility ability to be stretched.
Elasticity ability to recoil to their original resting length after they have been stretched.
epimysium skeletal muscle is surrounded by a connective tissue sheath
Fascia another connective tissue located outside the epimysium. It surrounds and separates muscles
perimysium A muscle is composed of numerous visible bundles called muscle fasciculi (fascicle), which are surrounded by loose connective tissue
fibers fasciculi are composed of single muscle cells
endomysium Each fiber is surrounded by a connective tissue sheath
myofibrils thread like structure that extends from one end of the fiber to the other.
actin Myofibrils consist of 2 major kinds of protein fibers
myofilaments thin myofilaments. They resemble 2 minute strands of pearls twisted together
myosin myofilaments thick myofilaments. They resemble bundles of minute golf clubs
sarcomeres Actin and myosin myofilaments form highly ordered units
resting membrane potential. The outside of most cell membranes is positively charged compared to the inside of the cell membrane
action potential. When a muscle cell is stimulated the membrane characteristics change briefly
Motor neurons nerve cells that carry action potentials to skeletal muscle fibers.
neuromuscular junction Axons enter the muscles and branch. Each branch that connects to the muscle forms
synapse near the center of the cell.
motor unit single motor neuron and all the skeletal muscle fibers
presynaptic terminal The enlarged nerve terminal
synaptic cleft space between the presynaptic terminal and the muscle cell
postsynaptic terminal the muscle fiber
synaptic vesicles Each presynaptic terminal
acetylcholine diffuses across the synaptic cleft and binds to the postsynaptic terminal
Created by: hager.
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