nervous system

Question 1

what are the 2 parts of the nervous system?

Answer 1

-central nervous system
- peripheral nervous system

Question 2

what is included in the cns?

Answer 2

• brain and spinal cord

Question 3

what is included in the pns?

Answer 3

spinal nerves and cranial nerves

Question 4

define stimulus

Answer 4

any chnage within the environment (internal/external)

Question 5

define receptor

Answer 5

sense organ- receives the stimulus

Question 6

define effector

Answer 6

muscle/gland that carries out the effect

Question 7

define electrical impulses

Answer 7

impulses which transmit msgs from sense organs to the cns and back again

Question 8

what are neurons?

Answer 8

nerve cells that send msgs thru out the body

Question 9

name the neurons that are part of the nervous system

Answer 9

• sensory
  -relay
  -motor

Question 10

what are the parts of a neuron?

Answer 10

• cell body
• nerve fibers
• axon
• dendron
• dendrites

Question 11

what is the cell body?

Answer 11

a structure that contains normal cell protoplasm

Question 12

what are the nerve fibres?

Answer 12

pathway for the transportation of stimuli (thru shifting of ions)

Question 13

what is the axon?

Answer 13

portion of the neuron that carries away the impulses

Question 14

what is a dendron?

Answer 14

nerve ending (dendrites as plural)

Question 15

what is a voluntary action?

Answer 15

actions under control of our will

Question 16

define involuntary action

Answer 16

actions not under the control of our will

Question 17

define reflex actions

Answer 17

a sudden response to a stimuli

Question 18

what is the reflex arc?

Answer 18

the nervous pathway that controls a reflex

Question 19

what is a conditioned reflex action?

Answer 19

acquired from past experiences with a stimulus which is originally ineffective in producing the response

Question 20

what is a synapse?

Answer 20

the junction between 2 neurons

Question 21

define synaptic gap

Answer 21

the junction between 2 neurons at a synapse

Question 22

what is a vesicle?

Answer 22

a very small vacuole

Question 23

define neurotransmitter

Answer 23

chemical stored in vesicles at the end of neurons.
can be released to diffuse across the synaptic gap &set up an electrical impulse in the next neuron

Question 24

what are receptor proteins?

Answer 24

on the membrane of the second neuron at a synapse