Cht 3

Question 1

Neurons

Answer 1

Cells in the nervous system that communicate with one another to perform information processing task

Question 2

Cell body (soma)

Answer 2

The part of a neuron that coordinates information processing test and keeps the cell alive

Question 3

Dendrite

Answer 3

The part of a neuron that receives information from other neurons and relays it to the cell body

Question 4

Axon

Answer 4

The part of a neuron that carries information to other neurons, muscles or glands

Question 5

Myelin sheath

Answer 5

An insulating layer of fatty material

Question 6

Glial cells

Answer 6

Support cells found in the nervous system

Question 7

Synapse

Answer 7

The junction or region between the axon of one neuron and the dendrites or cell body of another

Question 8

Sensory neurons

Answer 8

Neurons that receive information from the external world and convey this information to the brain

Question 9

Motor neurons

Answer 9

Neurons that carry signals from the spinal cord to the muscles produce movement

Question 10

Interneurons

Answer 10

Neurons that connect sensory neurons, or other interneurons.

Question 11

Conduction

Answer 11

The movement of an electric signal within a neuron, from the dendrites to the cell body, then throughout the axon

Question 12

Transmission

Answer 12

Movement of electric signals from one neuron to another over the synapse

Question 13

Resting potential

Answer 13

The difference in electrical charge when the neuron is at rest.

Question 14

1.The resting potential

Answer 14

In the resting state K+ ions flow freely across the cell membrane, but Na+ ions are kept out, creating a difference in electric charge between the inside and outside of a neuron’s cell membrane. The inside of the neuron has a charge of about -70 micro voltage related to the outside, which is the potential energy that will be used to generate the action potential

Question 15

2. The action potential

Answer 15

Electric stimulation of the neuron shuts down the K+ channels and opens the Na+ to rush in and increase the positive charge inside the Exxon related to the outside, triggering the action potential

Question 16

3. The imbalance in ions from the action potential is reversed by an active chemical “pump” in the cell membrane that moves and Na+ outside the axon and moves K+ inside the axon. The neuron can generate another action potential

Answer 16

http://m.china.coach.com/index.htm

Question 17

Resting potential

Answer 17

Difference in electric charge between the inside and outside of a neuron’s cell membrane=70mV

Question 18

Action potential

Answer 18

Electric signal that is conducted along a neuron’s axon to a synapse