B3.1.1 - Nervous System

Question 1

How does your nervous system work?

Answer 1

By detecting changes in your external environment and sending this information to your brain where it is processed and an appropriate response is created

Question 2

What is the change of environment in the nervous system?

Answer 2

Stimulus

Question 3

What are the groups of cells that detect the stimulus?

Answer 3

Sensory receptors

Question 4

What is the response in a nervous system caused by?

Answer 4

Effectors

Question 5

What are effectors?

Answer 5

Muscles or glands - muscles respond to an impulse by contracting, while glands react by releasing hormones

Question 6

Where are your receptor cells found?

Answer 6

In your sense organs

Question 7

Do all receptors detect all stimuli?

Answer 7

No, different receptors detect different stimuli

Question 8

What do receptors do?

Answer 8

They change the stimulus into electrical impulses

Question 9

Where do the electric impulses made by the receptors travel to?

Answer 9

The central nervous system (CNS)

Question 10

What does CNS stand for?

Answer 10

The central nervous system

Question 11

What is the CNS made up of?

Answer 11

The brain and the spinal cord

Question 12

What would receptor cells be for skin?

Answer 12

Pressure and temperature

Question 13

What would receptor cells be for a nose?

Answer 13

Smell and taste

Question 14

What would the stimulus be for a tongue?

Answer 14

Chemical

Question 15

What are the 3 different types of neurones?

Answer 15

Relay, sensory and motor

Question 16

What do sensory neurones do?

Answer 16

Carry electrical impulses from receptor cells to the CNS

Question 17

What do relay neurones do?

Answer 17

Carry electrical impulses from sensory neurones to motor neurones

Question 18

What do motor neurones do?

Answer 18

Carry electrical impulses from the CNS to effectors

Question 19

What are nerves?

Answer 19

Bundles of hundreds or thousands of neurones

Question 20

What is the direction of impulse in a sensory neurone?

Answer 20

Left to right

Question 21

What is the direction of impulse in a relay neurone?

Answer 21

Dendrites to axon

Question 22

What is the direction of impulse in a motor neurone?

Answer 22

Left to right

Question 23

What are the steps involved in a coordinated nervous reaction?

Answer 23

Stimulus -> Receptor Cells -> Sensory Neurone -> Spinal Cord -> Brain -> Spinal Cord -> Motor Neurone -> Effector -> Response

Question 24

How long does a coordinated nervous reaction last?

Answer 24

0.7 seconds