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Bio Chapter8

Goodcare Bio Chap 8 LPN

QuestionAnswer
Working Unit of All Nervous Tissue The Neuron
The Nervous System has 2 Anatomic Divisions The Central Nervous System (CNS) and The Peripheral Nervous System (PNS)
The Central Nervous System (CNS) the brain and spinal cord
The Peripheral Nervous System (PNS) all nerves outside the CNS including those branching directly off of the brain or spinal cord
Neurons are actually composed of three major parts the Cell Body (contains the nucleus) Dendrites and Axons
A neuron can only carry an impulse in one direction, so nerves must be paired. True or False A True
Afferent neurons Carry messages to the spinal cord from input sensors (they are also called sensory nerves.)
Efferent neurons Carry messages to muscles, glands, organs, etc to perform an action (they are called motor nerves.)
Nerve protective “wrappings" the endoneurium, perineurium, and the epineurium.
Neuroglial Cells (4 types) Astrocytes Oligodendrocytes Microglial cells Ependymal cells
Astrocytes provide physical support as well as nutrients and ions within nerve tissue.
Oligodendrocytes provide myelin sheaths around axons of neurons.
Microglial cells support neurons and phago-cytize bacteria and debris.
Ependymal cells form epithelia-like mem-brane to cover and line specialized brain and spinal cord parts
Aspects of Nerve Impulses The Resting State Changes in Membrane Potential Action Potential Rising Phase Falling Phase The Role of Myelin in Conduction
4 Neurotransmitters Norepinephrine Serotonin Dopamine Acetylcholine
Created by: TutorDavis17
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