Muscle Terms Flashcards
endomysium
wraps individual muscle fibers
perimysium
forms fasciculi
epimysium
covers entire muscle and continuous with tendon
what are the 4 characteristics of muscles
irritability, contractility, extensibility, elasticity
synergists
muscles which contract together for movement
antagonists
muscles performing opposite functions
parallel arrangement has
endurance, little strength
convergent arrangement
strength at defined point
sphincteral
close an opening
pennate
strong, short Burts. tire quickly
sarcolemma
cell membrane, skeletal muscle
sarcoplasm
cell cytoplasm, skeletal muscle
within the cell is a myofibrils which contains what
myofilaments
name two example of proteins found within muscles
actin, myosin
actin and myosin are bundled together within what
myofilaments
what is the job of the sarcoplasmic reticulum
to sequester calcium to be released when contracts
sarcomere is a defined length within the what
myofibril
when muscle contracts, the z-band gets
closer
isometric contraction
doesn’t generate movement. forces are equal
isotonic contration
generates movement
muscles cells are __ cells (shape)
cylindrical
muscle cells have __ nueromusclear intervention
1
what are the 4 parts of the Neuromuscular junction (NMJ)
motor neuron, synaptic cleft, motor end plate, acetylcholine (neurotransmitter)
what’s the name of the neurotransmitter in NMJ
acetylcholine
motor __ does what to allow receptors to bind to acetylcholine
increases the surface area
what enzyme breaks down acetylcholine
acetylcholinesterase
what is the purpose of the motor unit
motor neuron and all of the muscle cells it innervate
the more controlled muscles movement requires ___ motor units
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