The Nervous system

Question 1

What are receptors?

Answer 1

Groups of cells which are sensitive to a stimulus

Question 2

What do eyes sense?

Answer 2

Light receptors

Question 3

What do the nose sense?

Answer 3

smell receptors

Question 4

What does the tongue sense?

Answer 4

Taste receptors

Question 5

What does skin sense?

Answer 5

touch sensitive to pressure/pain

Question 6

What is the sensory neurone?

Answer 6

The nerve cell that carries the signals as electrical impulses from the receptors

Question 7

What is the relay neurone?

Answer 7

The nerve cells that carries signals from sensory neurones to motor neurones

Question 8

What is the motor neurone?

Answer 8

The nerve that carries signals from the central nervous system to the effectors

Question 9

What are the effectors?

Answer 9

Respond in different ways. Muscles contract in response to a nervous impulse.

Question 10

What is the synapse?

Answer 10

It is the connection between two neutrons (chemicals diffuse across the synapse).

Question 11

Name the 5 steps of the reflex arc?

Answer 11

1) Stimulous of the pain receptor
2) Impulse travels along the sensory neurone
3) Impulse passes along the relay neurone via the synapse
4) Impulse along the motor neurone, via synapse
5) Impulse reaches muscle and it contracts