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Bio 669 Exam 2 Questions and Answers
100% Solved | Graded A+
Neuron is composed of - ✔✔cell body, dendrites, axon
densely packed cell bodies in the CNS are called _____ - ✔✔nuclei
densely packed cell bodies in the PNS are called _____ - ✔✔Ganglia
What are dendrites? - ✔✔Receptive portions of the neuron; receives
information
What do axons do? - ✔✔Carry impulses away from the cell body
is membrane potential about the inside of the cell or the outside? -
✔✔inside of the cell
what is an electrochemical gradient? - ✔✔describes the forces affect on ion
movement if allowed to become permeable a membrane
when does action potential start? - ✔✔when a membrane is depolarized
enough that it triggers voltage-gated ion channels
What is a graded potential? - ✔✔changes in membrane potential that
decreases over distance
, ©NINJANERD 2024/2025. YEAR PUBLISHED 2024.
what Is a refectory period? - ✔✔a period immediately following stimulation
that is unresponsive for some time.
Reduced sensitivity
What is myelin? - ✔✔A segmented layer of lipid material, acts as insulation.
what is myelin called in the PNS? - ✔✔Schwann cells
What are the nodes of Ranvier? - ✔✔gaps/regular interruptions in the
myelin sheath
What is saltatory conduction? - ✔✔The flow of ions between segments of
myelin rather than alone the entire length of the axon. Like playing leap
frog.
What is divergence? - ✔✔ability of branching axons to influence many
neurons
What is convergence? - ✔✔Branches of numerous neurons converging on
one or a few neurons
Central Nervous System (CNS) is made up of - ✔✔brain and spinal cord
Peripheral Nervous System (PNS) is made up of - ✔✔cranial nerves and
spinal nerves
afferent pathways are_____ - ✔✔ascending
Bio 669 Exam 2 Questions and Answers
100% Solved | Graded A+
Neuron is composed of - ✔✔cell body, dendrites, axon
densely packed cell bodies in the CNS are called _____ - ✔✔nuclei
densely packed cell bodies in the PNS are called _____ - ✔✔Ganglia
What are dendrites? - ✔✔Receptive portions of the neuron; receives
information
What do axons do? - ✔✔Carry impulses away from the cell body
is membrane potential about the inside of the cell or the outside? -
✔✔inside of the cell
what is an electrochemical gradient? - ✔✔describes the forces affect on ion
movement if allowed to become permeable a membrane
when does action potential start? - ✔✔when a membrane is depolarized
enough that it triggers voltage-gated ion channels
What is a graded potential? - ✔✔changes in membrane potential that
decreases over distance
, ©NINJANERD 2024/2025. YEAR PUBLISHED 2024.
what Is a refectory period? - ✔✔a period immediately following stimulation
that is unresponsive for some time.
Reduced sensitivity
What is myelin? - ✔✔A segmented layer of lipid material, acts as insulation.
what is myelin called in the PNS? - ✔✔Schwann cells
What are the nodes of Ranvier? - ✔✔gaps/regular interruptions in the
myelin sheath
What is saltatory conduction? - ✔✔The flow of ions between segments of
myelin rather than alone the entire length of the axon. Like playing leap
frog.
What is divergence? - ✔✔ability of branching axons to influence many
neurons
What is convergence? - ✔✔Branches of numerous neurons converging on
one or a few neurons
Central Nervous System (CNS) is made up of - ✔✔brain and spinal cord
Peripheral Nervous System (PNS) is made up of - ✔✔cranial nerves and
spinal nerves
afferent pathways are_____ - ✔✔ascending
