Bio 669 Quiz 2 Questions And Answers With 100%
Correct Answers Latest Update 2024/2025.
Neuron is composed of - ANSWER cell body, dendrites, axon
densely packed cell bodies in the CNS are called _____ - ANSWER nuclei
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 affect on ion movement
if allowed to become permeable a membrane
when does action potential start? - ANSWER when a membrane is depolarized enough that it
triggers 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
Central Nervous System (CNS) is made up of - ANSWER brain and spinal cord
Peripheral Nervous System (PNS) is made up of - ANSWER cranial nerves and spinal nerves
afferent pathways are_____ - ANSWER ascending
efferent pathways are _____ - ANSWER descending
Correct Answers Latest Update 2024/2025.
Neuron is composed of - ANSWER cell body, dendrites, axon
densely packed cell bodies in the CNS are called _____ - ANSWER nuclei
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 affect on ion movement
if allowed to become permeable a membrane
when does action potential start? - ANSWER when a membrane is depolarized enough that it
triggers 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
Central Nervous System (CNS) is made up of - ANSWER brain and spinal cord
Peripheral Nervous System (PNS) is made up of - ANSWER cranial nerves and spinal nerves
afferent pathways are_____ - ANSWER ascending
efferent pathways are _____ - ANSWER descending
