5.1.3 - NEURONAL COMMUNICATION

Question 1

What are the THREE main types of neurones?

Answer 1

• Sensory
• Motor
• Relay (Intermediate)

Question 2

What does the sensory neurone do?

Answer 2

Transmits nerve impulses from receptors to the central nervous system (CNS) - brain + spinal cord

Question 3

What does the motor neurone do?

Answer 3

Transmits nerve impulses from the CNS to effectors

Question 4

What does the relay neurone do?

Answer 4

Transmits nerve impulses between sensory neurones and motor neurones

Question 5

State the path information takes as a nerve impulse in reaction to a stimulus

Answer 5

Stimulus —> Receptors —> CNS —> Effectors —> Response

Question 6

In what form does the nervous system send information?

Answer 6

Nerve impulses (electrical impulses)

Question 7

What is a transducer?

Answer 7

Something that converts one form of energy into another

Question 8

What is the structure of a sensory neurone?

Answer 8

• Cell body with a nucleus
• ONE long dendron to carry nerve impulses from receptor cells to the cell body
• ONE short axon to carry nerve impulses away from the cell body

Question 9

What is the structure of a motor neurone?

Answer 9

• Cell body
• MANY short dendrites that carry nerve impulses from the CNS to the cell body
• ONE long axon that carries nerve impulses from the cell body to effector cells

Question 10

What is the structure of a relay neurone?

Answer 10

• Cell body
• MANY short dendrites that carry nerve impulses from the sensory neurones to the cell body
• ONE axon that carries nerve impulses from the cell body to motor neurones

Question 11

Describe how resting potential is maintained in a neurone