SB2i Neurotransmission Speeds

Question 1

Describe the structures of motor neurones

Answer 1

short dendrites carry impulses from CNS to cell body
Cell body found at end of neurone
Long axon carrie impulse from cell body to effector

Question 2

Describe the structures of

relay neurones.

Answer 2

short dendrite carry impulse from sensory to cell body.

short axon carries impulses from cell body to motor neurone

Question 3

Explain the function of synapses.

Answer 3

Synpase is a small gap between neurones across which a nerve impulse is transmitted via neurotransmitters

Question 4

Explain action of synapses

Answer 4

Nerve impulse reach presynapatic neurones. Trigger release of neurotransmitters, diffuse across synapse, bind to receptors on postsynaptic neurone, stimulates an impulse in postsynaptic neurone

Question 5

Explain how the structure of the reflex arc allows a faster response.

Answer 5

Most reflexes don’t have to travel up to your brain to be processed, which is why they take place so quickly.

Question 6

Describe the structure of the

reflex arc.

Answer 6

stimulus→sensory receptor→sensory neurone→motor neurone→response

Question 7

Describe the function of the

reflex arc.

Answer 7

It is an immediate response to a particular stimulus.