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