Ch.13 Nervous System Flashcards Preview

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Flashcards in Ch.13 Nervous System Deck (12):
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Neuron

Basic unit of the nervous system

1

Glial cell (neuroglia cell)

Support and nourish neurons. Growth factors, make up myelin sheath from Schwann cells

2

Sensory vs. motor

Sensory - takes nerve signals from a sensory receptor to the cns

Motor- takes nerve impulses away from the cns to an effector - muscle fiber, organ, or gland

3

Axon

Is the portion of a neuron that conducts nerve impulses

4

Dendrite

Are short extensions that receive signals from sensory receptors to other neurons

5

Schwann cell

Cell that surrounds a fiber of a peripheral nerve and forms the myelin sheath

6

Sodium-potassium pump

Reestablishes the resting potential by pumping Na+ out and K+ in the neuron.

7

Action potential

Electrochemical changes that takes place across the axomembrane; the nerve impulses. - process of conduction that occurs In the axon of neurons. Nerve is stimulated

8

Refractory period

Nerve cannot be stimulated right after action potential; sodium channels closed and cannot be reopened

9

Neurotransmitter

Transmission across a synapse is carried out by molecules- chemical signal at synapse

10

Synapse

The region of close proximity between each terminals and either dendrite or cell body of another neurons.

11

Neuron summation

Neuron