Neurons

Question 1

What is a sensory neuron?

Answer 1

• The sensory neuron is afferent - it relays nerve impulses from the body of the sense organs to the central nervous system (Brain and Spinal cord)

Question 2

What structural features does the sensory neuron have?

Answer 2

• Synaptic endings
• axon
• dendrites
• dendron
• cell body
• node of ranvier
• myelin sheath
• shwann cells

Question 3

What is the motor neuron?

Answer 3

• The motor neuron is efferent - it relays nerve impulses from the CNS nervous system to the muscles (effectors)

Question 4

What structural features does the motor neuron have?

Answer 4

• axon
• dendrites
• cell body
• node of ranvier
• myelin sheath
• shwann cells

Question 5

What is a relay neuron?

Answer 5

• The interneurons relay nerve impulses from sensory neurons to motor neurons in the spinal cord

Question 6

What structural features does the relay neuron have?

Answer 6

• Dendrites
• cell body
• axons
• synaptic endings

Question 7

What is myelin?

Answer 7

• Myelin is a lipid and surrounds the axon
• it acts as an insulator and speeds up the conduction of nerve impulses
• it allows for saltatory conduction
• the myelin is produced by schwann cells, which wrap around the axon

Question 8

which neuron/s have a resting potential of -70mV?

Answer 8

• Sensory and motor neurons

Question 9

Which neuron connects to effectors?

Answer 9

• Motor neuron

Question 10

which neuron/s connects to other neurones via the synapses?

Answer 10

• Sensory and motor neuron

Question 11

What are some differences between motor neurones and sensory neurons?

Answer 11

• Motor neurones don’t contain any dendrons
• Sensory neurons carry signals from the outer parts of your body into the central nervous system whereas Motor neurons carry signals from the central nervous system to the outer parts of your body.