Page 7- Components of a Reflex Arc

Question 1

1)

Answer 1

1) A receptor reacts to a change in the internal or external environment by initiating a nerve impulse in a sensory neuron

Question 2

2

Answer 2

A sensory neuron carries a nerve impulse towards the spinal cord

Question 3

3

Answer 3

There is at least one synapse. The nerve impulse may be directly passed to a motor neuron or there may be one or more interneurons directing the message to the correct motor neuron.

Question 4

4

Answer 4

A motor neuron carries the nerve impulse to an effector

Question 5

5

Answer 5

An effector receives the nerve impulse and carries out the appropriate response. Effectors are muscles or glands.