Neurons

Question 1

What are neurons

Answer 1

• Specialised cells that carry neural info throughout the body

Question 2

Sensory neuron

Answer 2

• Carries messages from PNS to CNS

Question 3

Relay neuron (interneuron)

Answer 3

• Connects sensory to motor and other relay

Question 4

Motor neuron

Answer 4

• Connects CNS to effectors

Question 5

The structure of a neuron

Answer 5

• Cell Body = contains the genetic material of a cell
• Dendrites = carry nerve impulses from neurons towards the cell body
• Axons = Carries the impulses away from the cell body down the neuron
• Myelin Sheath = Covers the axon for protection and it speeds up electrical transmission of the impulse
• Nodes of Ranvier = speed up the transmission of the impulse by forcing it to jump across the gaps along the axon
• Terminal Buttons = Communicate with the next neuron in the chain across a gap (synapse)

Question 6

Location of neurons

Answer 6

• Motor neurons are in the CNS but have long axons and they form part of the PNS
• Sensory neurons are in the PNS
• Relay neurons are 97% of all neurons and are in the brain and visual system