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NRSG 201 EXAM 3 REVIEW QUESTIONS AND ANSWERS
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NRSG 201 EXAM 3 REVIEW QUESTIONS AND ANSWERS...
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which neurotransmitter works as a natural opiate that works as a painkiller?endorphins
torn rotator cuff
And shoulder, tear and tendons, or muscles in shoulder
a muscle contraction increases in strength up to a point because:
recruitment occurs and more motor units respond to stronger stimuli
what affects the force of muscle contraction?
-number of muscle fibers stimulated
-relative size of fibers
-frequency of stimulation
-length tension relationship
what activates your fight to flight system?
sympathetic system
what happens during muscle contraction in the sarcomere?
the H zone becomes less obvious and the Z discs move closer together
what would happen to the events at a chemical synapse if a neuron is exposed to
a calcium channel blocker?
neurotransmitter exocytosis would not occur from the presynaptic neuron
Thin filaments are composed of
actin
a major difference between smooth muscle fibers and skeletal muscle fibers in
terms of calcium influx is that
, calcium ion influx occurs mostly from the extracellular fluid in smooth muscle
a single contraction in response to a single threshold stimulus is defined as?
twitch
at the neuromuscular junction, what initiates the muscle impulse?
binding of acetylcholine to membrane receptors on the sarcolemma
inhibitory postsynaptic potentials (IPSPs) cause the postsynaptic membrane to
become more permeable to which ion?
potassium
the functional unit of a skeletal muscle
sarcomere
if chloride channels are opened in a postsynaptic neuron...
an IPSP will be generated
what happens during the absolute refractory period?
no action potential can be generated
what substance must bind to myosin for the heads to detach from the thin
filaments?
ATP
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a group of neuron cell bodies in the PNS
ganglion
A neuron currently has high sodium levels inside the cell, high potassium
outside of the cell, and the inside of the membrane is currently at -75 mV. What
is occurring?
hyperpolarization
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