bio 669 quiz 2 UPDATED ACTUAL Exam
Questions and CORRECT Answers
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
What does the somatic nervous system do? - CORRECT ANSWER - motor and sensory
pathways that regulate voluntary motor control of the skeletal muscles
Questions and CORRECT Answers
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
What does the somatic nervous system do? - CORRECT ANSWER - motor and sensory
pathways that regulate voluntary motor control of the skeletal muscles
