the nervous system

Question 1

what is a stimulus?

Answer 1

change in the internal or external enviroment

Question 2

what do receptors and effectors do?

Answer 2

receptors= detect stimulus
effectors= produce a response

Question 3

how do receptors commiuncate?

Answer 3

via the nervous system or horomonal system or both

Question 4

what are neurones?

Answer 4

nerve cells

Question 5

what are the 3 types of neurones?

Answer 5

sensory
relay
motor

Question 6

how is the central nervous system (CNS) able to bring very rapid responses?

Answer 6

because neurones transmit information using high speed electrical impulses

Question 7

what is a synapse?

Answer 7

connection between 2 neurones

Question 8

how is the nerve signals transffered?

Answer 8

nerve signals are transmitted through chemicals called neurotransmitters

Question 9

what is receptors to effectors called?

Answer 9

reflex arc

Question 10

what are the SIX steps of the reflex arc?

Answer 10

1. neurones go through spinal cord or unconsious part of brain
2. when a stimulus is detected by receptors, an impulse is sent along a sensory neurones

3.in the CNS the sensory neurone passes on the message to relay neurone

4. relay neurones relay the impulse to a motor neurone
5. impulse travels along the motor neurone to the effector
6. the muscle then contracts and moves

Question 11

the EIGHT steps of reflexes?

Answer 11

STIMULUS
RECEPTOR
SENSORY NEURONE
CNS
RELAY NEURONE
MOTOR NEURONE
EFFECTOR
RESPONSE