the reflex arc

Question 1

what are reflexes?

Answer 1

automated actions which do not involve the brain

Question 2

which 3 neurones do reflexes involve?

Answer 2

• sensory
• relay
• motot

Question 3

what is a reflex arc?

Answer 3

the movement of the impulse from receptor to effector

Question 4

what is the reflex response also known as?

Answer 4

the involuntary response

Question 5

how does the reflex response protect the body from harm?

Answer 5

responses are automatic and rapid

Question 6

what is the first step to the reflex arc?

Answer 6

the stimulus is detected by receptors in the skin and sends an impulse along the sensory neurone

Question 7

what is the 2nd step to the reflex arc?

Answer 7

a sensory neurone sends electrical impulses to the spinal cord

Question 8

what is the 3rd step to the reflex arc?

Answer 8

an electrical impulse is passed to a relay neurone in the spinal cord

Question 9

what is the 4th step to the reflex arc?

Answer 9

a relay neurone synapses with a motor neurone and passes the impulse through the spinal cord to a motor neurone

Question 10

what is the 5th step to the reflex arc?

Answer 10

a motor neurone carries the impulse to an effector

Question 11

what is the 6th step to the reflex arc?

Answer 11

when stimulated by the motor neurone, the effector will contract and move (the body part) away from the stimulus

Question 12

in the reflex arc is the brain involved?

Answer 12

• an impulse is sent to the brain
• the brain is not involved in coordinating the response

Question 13

what neurone connects the sensory and motor neurones together?

Answer 13

the relay neurones

Question 14

what do sensory neurones do in the reflex arc?

Answer 14

carry impulses from sense organs to the CNS

Question 15

where are relay neurones found?

Answer 15

inside the CNS

Question 16

what do motor neurones do in the reflex arc?

Answer 16

carry impulses from the CNS to effectors