Nervous System

Question 1

Explain what is meant with the life activity or sensitivity of the Nervous System

Answer 1

• identify STIMULI
• by RECEPTORS (means of sense organs)
• convert it to an IMPULSE
• interpret in the brain
• react with EFFECTOR (muscles/glands)

Question 2

What conducts impulses TO a cell

Answer 2

Dendrites

(HINT: think of the “t” in the word is TO)

Question 3

Explain what an AXON does in a cell

Answer 3

Conducts impulses AWAY from the cell

(HINT: Think of the “A” in AXON for the word AWAY)

Question 4

Give a definition of the word STIMULUS

Answer 4

This is for example light, sound and pain. It is received from the EXTERNAL environment.

Question 5

What is an impulse?

Answer 5

It is formed inside the NEURON and TRANSPORTED to the brain for interpretation.

Question 6

There are THREE components necessary to be sensitive. Name them.

Answer 6

1) receptors (sense organs)
2) brain
3) effectors (muscles and glands)

Question 7

Give ONE word for muscles and glands

Answer 7

EFFECTORS

Question 8

Give ONE word for sense organs

Answer 8

Reeptors

Question 9

There are 3 different neurons. What are they?

Answer 9

1) Motor neuron
2) Interneuron
3) Sensory Neuron

Question 10

Provide another definition for MOTOR NEURON and explain why

Answer 10

Multi Polar - lots of out growths takes impulse to effectors

Question 11

Provide another definition for an INTERNEURON and explain why

Answer 11

Bipolar - 2 runners joining A and C

Question 12

Provide another definition for the SENSORY NEURON and explain why

Answer 12

Monopolar - one runner (in sense organs to convert stimuli to impulses)

Question 13

Explain what the human brain is

Answer 13

It is an organ

Question 14

Why is the human brain an organ?

Answer 14

It has nerve tissue AND blood tissue

Question 15

What is the section called that is right on the top of the brain?

Answer 15

Cerebrum

Question 16

What is the function of the Cerebrum?

Answer 16

> voluntary actions
site of awareness
memory, judgement and reasoning

Question 17

Which section in the brain is responsible for your memory?

Answer 17

Cerebrum

Question 18

Which section in your brain is responsible for your balance?

Answer 18

Cerebellum

Question 19

What are the functions of the Cerebellum in your brain?

Answer 19

1) co-ordination of voluntary actions
2) maintaining muscle, tone and balance

Question 20

Which section in your brain is responsible for your heartbeat and breathing?

Answer 20

Medulla oblangata

Question 21

Give 2 functions of the medulla oblangata

Answer 21

• heartbeat
• breathing

Question 22

What is responsible for the movement of impulses to and from the brain?

Answer 22

your spinal cord

Question 23

Name 2 functions of the spinal cord

Answer 23

1) Controls reflex actions
2) Impulse move to and from the brain