Ch.13 Nervous System

Question 0

Glial cell (neuroglia cell)

Answer 0

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

Question 1

Neuron

Answer 1

Basic unit of the nervous system

Question 2

Sensory vs. motor

Answer 2

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

Question 3

Axon

Answer 3

Is the portion of a neuron that conducts nerve impulses

Question 4

Dendrite

Answer 4

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

Question 5

Schwann cell

Answer 5

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

Question 6

Sodium-potassium pump

Answer 6

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

Question 7

Action potential

Answer 7

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

Question 8

Refractory period

Answer 8

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

Question 9

Neurotransmitter

Answer 9

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

Question 10

Synapse

Answer 10

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

Question 11

Neuron summation

Answer 11

Neuron