The Nervous System

Question 1

What’s stimulus?

Answer 1

a change in the environment, or anything causing a reaction in an organism

Question 2

CNS stands for?

Answer 2

central nervous system

Question 3

PNS stands for?

Answer 3

peripheral nervous system

Question 4

What does CNS consist of?

Answer 4

brain & spinal chord

Question 5

What does PNS consist of?

Answer 5

network of nerves (in form of nerve fibres)

Question 6

What’s reception?

Answer 6

stimulus must be detected

Question 7

What’s transmission?

Answer 7

the message passes along the neuron’s

Question 8

Two effectors are?

Answer 8

muscles or glands

Question 9

What’s a neuron?

Answer 9

is a nerve cell

Question 10

What’s a sensory neuron?

Answer 10

transmits an impulse to the CNS

Question 11

What’s a motor neuron?

Answer 11

transmits impulses from the CNS to a muscle or a gland

Question 12

What’s integration?

Answer 12

the incoming messages are sorted and processed and a response decided upon

Question 13

Where does integration take place?

Answer 13

in CNS, especially in the brain

Question 14

What carries out the response and when?

Answer 14

effectors (muscle/gland) when they are stimulated by neuron

Question 15

Whats a receptor and function?

Answer 15

cell or group of cells that detects a stimulus

Question 16

Function of nerve endings?

Answer 16

connect sensory neurons to receptor cells or sense organs

Question 17

What are dendrites and function?

Answer 17

fibres that transmit impulses towards the cell body & recieve impulses, transmitting them to CNS

towards! cell body

Question 18

letter ‘a’ and carry away from cell body

What are axons function?

Answer 18

transmit impulses away from cell bodies/transmit impulses to an effector

Question 19

What do schwann cells produce?

Answer 19

the myelin sheath

Question 20

The myelin sheath is produced by?

Answer 20

schwann cells

Question 21

Whats the myelin sheath and function?

Answer 21

its a fat-rich layer that insulates the electrical impulses

Question 22

Why is myelin sheath important?

Answer 22

speeds up transmission of nerve impulses

Question 23

Whats role of cell body? (3)

Answer 23

1. recieves impulses
2. produce neurotransmitters
3. controls passage of impulses

Question 24

What does cell body contain?

Answer 24

nucleus & cell organelles

Question 25

How are axon terminals formed?

Answer 25

branches made by the splitting of an axon

Question 26

What do axon terminals do?

Answer 26

carry impulse to a swelling called a neurotransmitter swelling

Question 27

What do neurotransmitter swellings do?

Answer 27

release chemicals that carry the impulse from one nerve cell to another

Question 28

What are chemicals in neurotransmitter swellings called?

Answer 28

neurotransmitters

Question 29

Where are neurotransmitters stored?

Answer 29

in vesicles in the swellings

Question 30

Whats a ganglion?

Answer 30

group of cell bodies located outside the CNS

Question 31

Whats an interneuron?