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Ch. 6 Muscle

Contractility muscle shortens
Excitability muscle reacts to stimulus
Extendability muscle stretches
Elasticity muscle recoils after stretch
muscle cells fibers
connective tissue surrounding skeletal muscle epimysium
connective tissue outside the epimysium fascia
connective tissue surrounding fascicle perimysium
connective tissue covering fiber endomysium
cytoplasm of each fiber myofibril
2 major kinds of protein fibers actin & myosin
thin myofilament actin
thick myofilament myosin
basic structural and functional unit of the muscle sarcomere
exists from z line to z line sarcomere
light area and what it consists of I Band, actin
dark area and what it consists of A Band, myosin
positively charged cell membrane is found outside
negatively charged cell membrane is found inside
when you stimulate a muscle cell membrane characteristics change
difference in membrane charges resting membrane potential
reversal of charge action potential
carry action potentials to skeletal muscle cells motor neurons
threadlike part of nerve cell axon
branch through muscles axon
‘synapse’ each branch that connects to muscle neuromuscular junction
motor neuron and the muscle fibers it interacts w motor unit
usually forms a single cell motor unit
how is a neuromuscular junction formed enlarged nerve terminal on muscle cell membrane
enlarged nerve terminal presynaptic terminal
between presynaptic terminal and muscle cell synaptic cleft
muscle fiber made of presynaptic terminal and synaptic cleft postsynaptic terminal
secretes acetylcholine synaptic vesicles
causes change in postsynaptic cell acetylcholine
action potential reaches nerve terminal, synaptic vesicles release acetylcholine to synaptic cleft exocytosis
envelopes fibers of skeletal muscles sarcolemma
actin myofilaments slide last myosin sliding filament mechanism
contraction of entire muscle due to stimulus muscle twitch
level at which muscle responds to a stimulus threshold
time between stimulus and contraction lag phase
time of contraction contraction phase
muscle relaxes relaxation phase
muscle remains contracted tetany
increase in activated motor units recruitment
needed for muscle contraction ATP
w out oxygen anaerobic respiration
w oxygen aerobic respiration
ATP is used faster than it’s made muscle fatigue
tension increases, length remains the same isometric
length changes, tension remains the same isotonic
constant muscle tension produced muscle tone
head, stationary end of muscle origin
end of muscle w most movement insertion
between head and insertion belly
muscles work together synergists
muscles work in opposition antagonists
major roll in synergists prime mover
orbicularis facial circles mouth
risorius facial draws back mouth
procerus facial frowning eyebrows
nasalis facial flares nostrils
mentalis facial wrinkles chin
buccinator facial compresses cheeks
depressor supercilii facial depression of eyebrow
corrugator supercilii facial wrinkles forehead
levator anguli oris facial smile
depressor anguli oris facial frown
largest muscle in body gluteus maximus
muscular heart tissue myocardium
fasciculi made of fibers
Created by: MarleeHutchinson