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Bio 669 Quiz 2 well Answered

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Bio 669 Quiz 2 well Answered 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; re...

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  • November 10, 2024
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Bio 669 Quiz 2 well Answered


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


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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


What does the somatic nervous system do? - ANSWER✔✔-motor and sensory pathways that regulate

voluntary motor control of the skeletal muscles


What does the autonomic nervous system do? - ANSWER✔✔-motor and sensory pathways that regulate

the bodies internal environment through involuntary control or organ systems


What is Wallerian degeneration? - ANSWER✔✔-degeneration of a nerve fiber that has been separated

by an injury or disease


What is a synapse? - ANSWER✔✔-Gap between neurons


What is temporal summation? - ANSWER✔✔-time


What is spatial summation? - ANSWER✔✔-distance


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