The Reflex Arc

Question 1

The neurones in reflex arcs go through the [ ] or through an [ ].

Answer 1

Spinal chord

Unconscious part of the brain

Question 2

What happens when a stimulus is detected by receptors? (1st step)`

Answer 2

Impulses are sent along a sensory neurone to the CNS (Central Nervous system)

Question 3

What happens when the impulses reach a synapse between the Sensory neurone and the [ ] neurone?

Answer 3

Relay

They trigger chemicals to be released. These chemicals cause impulses to be sent along the relay neurone

Question 4

When the impulses reach a synapse between the relay neurone and a [ ] neurone, they trigger [ ] to be released which cause [ ] to be sent along the motor neurone.

Answer 4

Motor
Chemicals
Impulses

Question 5

The impulses travel from the motor neurone to the [ ].

Answer 5

Effector

Question 6

Describe the process that would happen if a bee stung your finger, using the reflex arc.(6)

Answer 6

1) Bee stings finger
2) Stimulationn of pain receptors
3) Message travels along a sensory neurone
4) Message is passed along a relay neurone
5) Message travels along a motor neurone
6) When message reaches muscle (Effector) it contracts

Question 7

Name each step of a reflex arc (in order).

Answer 7

Stimulus, Receptor, Sensory Neurone, Relay Neurone, Motor Neurone, Effector, Response