NERVOUS SYSTEM

Question 1

What do receptors do?

Answer 1

They detect stimuli, through groups of cells in the sense organs (rods and cones in the eye)

Question 2

What do effectors do?

Answer 2

Cells that bring a response to stimuli - muscle cells and cells in glands (muscle cells contract, glands secrete hormones)

Question 3

What do receptors do?

Answer 3

Communicate with effectors through the nervous system

Question 4

What is the CNS made of? What does it do?

Answer 4

The brain and the spinal cord
It co-ordinate responses to stimuli

Question 5

What are the 3 types of neurons?

Answer 5

Sensory neurone
Relay neurone
Motor neurone

Question 6

What is a synapse?

Answer 6

A connection between 2 neurones
When stimulated the first neurone releases neurotransmitters
These diffuse across the synapse to the next neurone
That stimulates a response in the next neurone
The neurotransmitters are broken down by enzymes in the 2nd neurone

Question 7

What is the entire reflext arc?

Answer 7

1 - When a receptor recieves a stimuli, an impulse is sent from the sensory neurone to the CNS
2 - The CNS passes on the message to a relay neurone
3 - This relay neurone relays an impulse to the correct motor neurone
4 - this impulse travels from the motor neurone to the effector
5 - a response is stimulated in the effector