Module 5

Question 1

What are dendrons?

Answer 1

Short extensions that come from the cell body, splitting off into smaller dendrites.

Question 2

What is the role of dendrons?

Answer 2

Transmitting electrical impulses TOWARDS the cell body.

Question 3

What are axons? What is their role?

Answer 3

Singular long nerve fibres protruding from the cell body.
Their role is to transmit electrical impulses AWAY from the cell body.

Question 4

How many axons and dendrons does a sensory neurone have?

Answer 4

One axon, one dendron.

Question 5

How many axons and dendrons does a relay neurone have?

Answer 5

Many of each.

Question 6

How many axons and dendrons does a motor neurone have?

Answer 6

One long axon, many short dendrons.

Question 7

What do ALL sensory neurones act as?

Answer 7

A TRANSDUCER, meaning they convert a stimulus into a nerve impulse.

Question 8

What are the four types of sensory receptor present in animals? (State what each one is)

Answer 8

Mechanoreceptor (pressure/movement)
Chemoreceptor (chemicals)
Thermoreceptor (heat)
Photoreceptor (light)

Question 9

What type of receptor is the pacinian corpuscle an example of?

Answer 9

Mechanoreceptor.

Question 10

What is the resting potential normally?

Answer 10

-70mv.