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Bio 669 Quiz 2 With Complete Solution
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Bio 669 Quiz 2 With Complete Solution...
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Bio 669 Quiz 2 With Complete SolutionNeuron is composed of - ANSWER cell body, dendrites, axon
a. densely packed cell bodies in the CNS are called _____ - ANSWER nuclei
b. densely packed cell bodies in the PNS are called _____ - ANSWER Ganglia
What are dendrites? - ANSWER Receptive portions of the neuron; receives information
What do axons do? - ANSWER Carry impulses away from the cell body
is membrane potential about the inside of the cell or the outside? ANSWER inside of the
cell
what is an electrochemical gradient? ANSWER describes the forces that affect ion
movement if it is allowed to become permeable across a membrane
when does action potential start? ANSWER when a membrane is depolarized enough
that it opens voltage-gated ion channels
What is a graded potential? - ANSWER changes in membrane potential that decreases
over distance
what Is a refectory period? - ANSWER a period immediately following stimulation that is
unresponsive for some time.
Reduced sensitivity
What is myelin? - ANSWER A segmented layer of lipid material, acts as insulation.
, what is myelin called in the PNS? - ANSWER Schwann cells
What are the nodes of Ranvier? ANSWER gaps/regular interruptions in the myelin
sheath
What is saltatory conduction? ANSWER The flow of ions between segments of myelin
rather than alone the entire length of the axon. Like playing leap frog.
What is divergence? ANSWER ability of branching axons to influence many neurons
What is convergence? ANSWER Branches of numerous neurons converging on one or a
few neurons
CNS consists of - ANSWER brain and spinal cord
PNS consists of- ANSWER cranial nerves and spinal nerves
afferent pathways are_____ - ANSWER ascending
efferent pathways are _____ - ANSWER descending
What is the function of the somatic nervous system? - ANSWER motor and sensory
pathways that govern voluntary motor control of the skeletal muscles
What is the role of the autonomic nervous system? -ANSWER motor and sensory
pathways that control the body's internal environment via involuntary control or organ
systems
What is Wallerian degeneration? -ANSWER degeneration of a nerve fiber that has been
transected by an injury or disease
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