2j Coordination and Response

Question 1

What is the CNS?

Answer 1

Central Nervous System
is the spinal cord and brain

Question 2

What is the PNS?

Answer 2

Peripheral Nervous System
is the collection of neurons connected to the CNS

Question 3

What are neurons?

Answer 3

Neurons carry electrical impulses to carry messages from place to place

Question 4

What do hormones do?

Answer 4

• Long term effects - slower responses
• Travels in the blood
• Released from endocrine glands
• Some examples are ADH and adrenaline
• Responsible for fight and flight

Question 5

What do Neurons do?

Answer 5

Short term effects - faster response
- Responsible for transmitting information about sounds and smells
- Responsible for transmitting information about pain
- Travel in the nerves - pass messages as electrical signals
- Found in the brain and spinal cord
- Involved in reflex actions

Question 6

Why is the axon long?

Answer 6

Because it is responsible for carrying the electrical impulses around the body

Question 7

What happens in the synapses so they are able to pass an impulse from one neurone to the next?

Answer 7

1) Electrical impulse comes towards the synapse
2) Neurotransmitters are stored there, the electrical impulses travel there and become neurotransmitters
3) Neurotransmitters are released from the end of one neurone which diffuses from the synapse
4) When the neurotransmitters reach the next neurone they cause a new electrical impulse to be sent

Question 8

What are the 3 types of neurones called?

Answer 8

Sensory neurone
Relay neurone
Motor neurone

Question 9

What is a sensory neurone?

Answer 9

Carry out nerve impulses from receptor cells in the body towards the CNS

Question 10

What are relay neurones?

Answer 10

Make connections between neurones inside your brain and your spinal cord

Question 11

What are motor neurones?

Answer 11

Carry nerve impulses from your brain to your muscles / glands (effectors)

Question 12

What is the sense organ