BP- Neurons

Question 1

What are neurons?

Answer 1

specialised nerve cells that move electrical impulses to and from the CNS

Question 2

What are dendrites?

Answer 2

recieve an electrical impulse (action potential) from other neurons or sensory receptors.

Question 3

What is an axon?

Answer 3

A long fibre that carries the electrical impulse from the cell body to the axon terminal.

Question 4

What is the myelin sheath?

Answer 4

Insulating layer that protects the axon and speeds up the transmission of the electrical impulse.

Question 5

What are the Nodes of Ranvier?

Answer 5

These are gaps in the myelin sheath that speed up transmission of electrical impulse along the axon.

Question 6

Where are sensory neurons found?

Answer 6

Sensory neurons are found in the sensory receptors (e.g eyes, ears, tongue and skin)
- long dendrites and short axon

Question 7

What is the role of sensory neurons?

Answer 7

• Sensory neurons carry electrical impulses from sensory receptors to the CNS via the PNS.

Question 8

What is the role of motor neurons?

Answer 8

• They send electrical impulses via long axons to the glands and muscles called effectors.
• short dendrites and long axons

Question 9

Where are relay neurons found?

Answer 9

Relay neurons are found in the CNS.(spinal cord)

- short dendrites and short axons

Question 10

What is the role of the relay neuron?

Answer 10

• They connect sensory neurons to motor

neurons so that they can communicate with one another.