Bio 669 Quiz 2 with 100% complete
solutions to pass
Neuron is composed of - correct answer ✔✔cell body, dendrites, axon
densely packed cell bodies in the CNS are called _____ - correct answer ✔✔nuclei
densely packed cell bodies in the PNS are called _____ - correct answer ✔✔Ganglia
What are dendrites? - correct answer ✔✔Receptive portions of the neuron; receives
information
What do axons do? - correct answer ✔✔Carry impulses away from the cell body
is membrane potential about the inside of the cell or the outside? - correct answer ✔✔inside of
the cell
what is an electrochemical gradient? - correct answer ✔✔describes the forces affect on ion
movement if allowed to become permeable a membrane
when does action potential start? - correct answer ✔✔when a membrane is depolarized
enough that it triggers voltage-gated ion channels
What is a graded potential? - correct answer ✔✔changes in membrane potential that decreases
over distance
, what Is a refectory period? - correct answer ✔✔a period immediately following stimulation that
is unresponsive for some time.
Reduced sensitivity
What is myelin? - correct answer ✔✔A segmented layer of lipid material, acts as insulation.
what is myelin called in the PNS? - correct answer ✔✔Schwann cells
What are the nodes of Ranvier? - correct answer ✔✔gaps/regular interruptions in the myelin
sheath
What is saltatory conduction? - correct 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? - correct answer ✔✔ability of branching axons to influence many neurons
What is convergence? - correct answer ✔✔Branches of numerous neurons converging on one
or a few neurons
Central Nervous System (CNS) is made up of - correct answer ✔✔brain and spinal cord
Peripheral Nervous System (PNS) is made up of - correct answer ✔✔cranial nerves and spinal
nerves
afferent pathways are_____ - correct answer ✔✔ascending
efferent pathways are _____ - correct answer ✔✔descending
solutions to pass
Neuron is composed of - correct answer ✔✔cell body, dendrites, axon
densely packed cell bodies in the CNS are called _____ - correct answer ✔✔nuclei
densely packed cell bodies in the PNS are called _____ - correct answer ✔✔Ganglia
What are dendrites? - correct answer ✔✔Receptive portions of the neuron; receives
information
What do axons do? - correct answer ✔✔Carry impulses away from the cell body
is membrane potential about the inside of the cell or the outside? - correct answer ✔✔inside of
the cell
what is an electrochemical gradient? - correct answer ✔✔describes the forces affect on ion
movement if allowed to become permeable a membrane
when does action potential start? - correct answer ✔✔when a membrane is depolarized
enough that it triggers voltage-gated ion channels
What is a graded potential? - correct answer ✔✔changes in membrane potential that decreases
over distance
, what Is a refectory period? - correct answer ✔✔a period immediately following stimulation that
is unresponsive for some time.
Reduced sensitivity
What is myelin? - correct answer ✔✔A segmented layer of lipid material, acts as insulation.
what is myelin called in the PNS? - correct answer ✔✔Schwann cells
What are the nodes of Ranvier? - correct answer ✔✔gaps/regular interruptions in the myelin
sheath
What is saltatory conduction? - correct 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? - correct answer ✔✔ability of branching axons to influence many neurons
What is convergence? - correct answer ✔✔Branches of numerous neurons converging on one
or a few neurons
Central Nervous System (CNS) is made up of - correct answer ✔✔brain and spinal cord
Peripheral Nervous System (PNS) is made up of - correct answer ✔✔cranial nerves and spinal
nerves
afferent pathways are_____ - correct answer ✔✔ascending
efferent pathways are _____ - correct answer ✔✔descending
