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EXPH 386 Exam 3 Questions and Correct Answers
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EXPH 386 Exam 3 Questions and Correct Answers
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Exph 386 Exam 3neuromuscular system - Answer-coordination and integration of the muscles and the nerves that supply
them
cell body (soma) - Answer-action potential begins here, dictates the critical firing rate of the action
potential
dendrites - Answer-neural branches that receive impulses and conduct them toward the cell body
axon - Answer-deliver action potentials to the motor endplate of the muscle. larger ______ = faster
conduction velocities
myelin sheath - Answer-lipoprotein membrane that wraps around the axon, acts as an electrical
insulator
schwann cells - Answer-create or deposit the myelin sheath
nodes of ranvier - Answer-interrupt the myelin sheath every 1-2 mm along the axon
,salutatory conduction - Answer-allows the action potential to jump from node to node
slower - Answer-if no myelin were present, conduction velocities would be a lot ....
nerve terminal branches - Answer-multiple extensions of the axon that innervate individual muscle
fibers
motor endplate / neuromuscular junction - Answer-interface between the end of the axon @ the
terminal branch and the muscle fiber
multinucleated cylindrical cells (fibers) - Answer-skeletal muscles of the body are composed of
___________ _________ ______ (_______) which run parallel to each other. Force is directed along the
long axis
fiber length - Answer-can vary from a few mm in small muscles (eye) to approx. 30 cm in large muscles
(leg)
connective tissue layers associated with skeletal muscle - Answer-endomysium
perimysium
fasiculus
epimysium
tendons
periosteum
endomysium - Answer-wraps each muscle fiber and separates it from others
perimysium - Answer-bundle surrounding up to 150 fibers
, fasiculus - Answer-large bundle of fibers
epimysium - Answer-surrounds the entire muscle
tendons - Answer-extension of the epimysium at the ends of the muscle connecting to bone
periosteum - Answer-bones outermost covering; tendons connect the muscle to this
skeletal muscle structures - Answer-sarcolemma
basement membrane
sarcoplasm
sarcoplasmic reticulum
sarcolemma - Answer-muscle fiber membrane, thin elastic membrane that encloses the fiber's cellular
contents, true fiber boundary
basement membrane - Answer-loose collection of glycoproteins and collagen, outside the muscle fiber
sarcoplasm - Answer-contains the nuclei, substrates, enzymes for metabolism, mitochondria, and other
specialized organelles
sarcoplasmic reticulum - Answer-highly specialized network of tubular channels that allows a wave of
depolarization to spread rapidly from sarcolemma to inner environment through T-tubules to initiate
muscle contraction
stores a large amount of calcium
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