synapse & reflexes

Question 1

the reflex arc

Answer 1

a dangerous stimulus is detected by receptors.
impulses are sent along a sensory neuron.
in the CNS the impulse passes to a ​relay neuron​.
impulses are sent along a motor neuron.
the impulse reaches an effector resulting in the appropriate response.

Question 2

what’s the order of the reflex arc:

what the mnemonic stands for:

Answer 2

stimulus
receptor cells
sensory neurone 
synapse
relay neurone 
motor neurone 
effector cell
response

Question 3

what’s a synapse?

Answer 3

a gap between two neurones

Question 4

function of a reflex arc:

Answer 4

it allow us to react quicker to dangerous situations, this is because the nerve impulse doesn’t pass through the brain

Question 5

reflex actions:

receptors:

Answer 5

they sense the stimulus - change in environment, heat

Question 6

reflex actions:

CNS

Answer 6

co‐ordinates the response and send impulses to effectors (muscles/glands) which bring about the response.

Question 7

reflex actions:

neurones

Answer 7

carry electrical signals (impulses) to the CNS (brain or spinal cord)

Question 8

reflex actions:

stimuli

Answer 8

change in environment, light, heat, pressure