Topic 2- The Nervous System

Question 0

What is the CNS made up of?

Answer 0

The brain and the spinal cord

Question 1

What is the CNS?

Answer 1

The central nervous system

Question 2

What are the nerves role in the CNS?

Answer 2

They connect all of the body to the CNS

Question 3

What are nerves made up of?

Answer 3

Specialised cells called neurones

Question 4

Describe the axon

Shape and function

Answer 4

Very long and thin

Section that the information travels along

Question 5

What are dendrites?

Answer 5

They are on the cell body

They are the points where one nerve cell connects to another

Question 6

What do nerves do?

Answer 6

Carry messages to and from the CNS

Question 7

What form are these messages?

Answer 7

Electrical impulses

Question 8

How does a message travel from one neurone to the next?

Answer 8

It has to cross the synapse

Question 9

What is the synapse?

Answer 9

A small gap between neurones

Question 10

How does the message get across the synapse?

Answer 10

The neurone releases a chemical signal which is picked up by the next neurone

Question 11

What do sensory nerves do?

Answer 11

Carry information from the sense organs

Question 12

What happens to the information gained by the sensory organ?

Answer 12

It is stores in the CNS

Question 13

What carries the information from the CNS?

Answer 13

Motor nerves

Question 14

Where do the motor nerves carry the information?

Answer 14

To the muscles and glands

Question 15

Describe the CNS process

Answer 15

The CNS receives information from all of the sense organs via sensory nerves about the body and the environment. The CNS sorts this information and stores some of it.
When the body needs to do something the CNS sends out information along the motor nerves to muscles and other parts of the body to make a response

Question 16

Describe a reflex arc

Answer 16

1. The stimulus from the environment is detected by a sense organ
2. The sense organ sends a message through the sensory neurone to the relay neurone in the CNS
3. The CNS processes the message and sends a message along the motor neurone
4. The motor nerve sends the message to the muscle to give a response

Question 17

What 3 words describe a reflex arc?

Answer 17

Rapid
Automatic
Involuntary

Question 18

Why do humans have reflex actions?

Answer 18

To protect the body from harm and maintain the body’s position

Question 19

Does a reflex action need the brain and why?

Answer 19

No because it is not conscious thought

Question 20

What does the cerebrum do?

Answer 20

Controls learning, memory, personality, reasoning and controls conscious reactions/movements

Question 21

What does the medulla do?

Answer 21

Controls the rate of breathing and heart rate

Question 22

What does the cerebellum do?

Answer 22

Controls balance and muscular co ordination