the nervous system

Question 1

what are the two parts that the nervous system consists of

Answer 1

the central nervous system e.g. brain or spinal cord
and other nerves running to and from the cns

Question 2

how are electrical impulses sent from the receptor cells to the co-ordination centre

Answer 2

via neurons

Question 3

what are neurons

Answer 3

nerve cells

Question 4

what is the key role of the nervous system

Answer 4

it enables humans to react to their surroundings and co-ordinate their behavior

Question 5

what happens when you tough a hot object?

Answer 5

1. the stimulus (heat) is detected by a receptor (skin)
2. electrical impulses pass from the receptor to the CNS along a sensory neuron
3. a chemical is released at the synapse and diffuses across to a relay neuron in the CNS
4. this triggers an electrical impulse which gets passed across the relay neurons to another synapse
5. another chemical is released triggering an electrical impulse in a motor neuron
6. this passes to the effector which initiates a response

Question 6

what is the junction called found at the end of a sensory neuron

Answer 6

a synapse

Question 7

true or false?
in the case of reflexes there is no decision making by the conscious part of the brain

Answer 7

true

Question 8

how do reflexes protect us from danger

Answer 8

they are rapid, and automatic