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Bio 182
Nervous System
18
Biology
Undergraduate 1
04/23/2011

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Term
2 major cells of the nervous system
Definition
Neurons and Gilia
Term
Axon
Definition
Long extensions that conduct signals over long distances
Term
Nerve
Definition
Bundle of axons from many neurons
Term
Afferent neurons
Definition
carry information into nervous system
Term
Efferent neurons
Definition
carry commands to muscles and glands
Term
Glia Cells
Definition
Support during development, supply nutrients, maintain extracellular environment and insulate axons
Term
Central Nervous System
Definition
Brain and Spinal cord
Term
Peripheral Nervous System
Definition
Outside the Central Nervous System
Term
4 Parts of the Neuron and function
Definition
Cell Body: nucleus and majority of organelles
Dendrites: receive information
Axon: long, carry information away
Axon Terminals: form synapse
Term
Schwann Cell covering is composed of?
Definition
Myelin
Term
Nodes of Ranvier
Definition
Space between Schwann Cells
Term
Astrocytes
Definition
Contribute to blood-brain barrier. Blood carries toxins.
Term
Action Potential
Definition
The result of ions moving across the plasma membrain
Term
Primary ions involved in action potential
Definition
Sodium
Potassium
Calcium
Chloride
Term
What is the function of the NaK pump?
Definition
uses ATP to move Na ions from inside the cell and exchanges them for K from outside the cell
Term
How does an nerve impulse travel across the synapse?
Definition
communication between neurons or target cells. Motor neuron releases acetylcholine from its axon terminals.
Term
Effects of Dopamine
Definition
Effects CNS, prevents normal uptake
Term
Effects of Serotonin
Definition
Effects CNS, pain control, sleep/wake, mood. LSD mimic action.
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