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Nervous System

Nervous System Basics

Nervous system function/purpose: control body's actions & senses.
How does the nervous system control the body? collects sensory information, processes & interprets information, & initiates a response.
The Central Nervous System (CNS) consists of: cell bodies, axons, & dendrites.
A cell body consists of: a nucleus & organelles.
Axons are: elongated projections that carry signals AWAY from a cell body. They may have branches (called collaterals) to comminicate with many neurons.
Dendrites: are extentions of a cell's cytoplasm, which carry signals TO the cell body.
The space or junction between two neurons (or neuron and organ) is called a: synapse/synaptic cleft.
The electrical nerve impulse transformes into what kind of signal? chemical (neurotransmitter).
Why is the electrical signal transformed into chemical? to cross the synapse/junction.
The neuron sending the signal across is: presynaptic.
The neuron or organ recieving the signal is: post-synaptic.
How many neurotransmitters have been identified? over 30.
Main neurotransmitters: Acetylcholine, catecholamines, cholecytokinin, endorphine.
Acetylcholine stimulates the skeletal muscles
Catecholamines Epinephrine, norepinephrine, dopamine, histamine, & serotonin are involved in sleep, motor function, mood, & pleasure.
Epinephrine, norepinephrine, dopamine, histamine, & serotonin are: Catecholamines (involved in sleep, motor function, mood, & pleasure)
Created by: Sonhos