HOMEOSTASIS AND RESPONSE - Nervous System

Question 1

Nervous System

Answer 1

Enables humans to react to their surroundings and co-ordinate their behaviour

Question 2

How Does Information Pass Along?

Answer 2

Information from receptors passes along neurones as electrical impulses to the CNS. The CNS coordinates the response of effectors which may be muscles contracting or glands secreting hormones
Stimulus –> Receptor –> Co-Ordinator –> Effector –> Response

Question 3

Reflex Action

Answer 3

1) The pain stimulus is detected by receptors.
2) Impulses from the receptor pass along a sensory neuron to the CNS
3) An impulse then passes through a relay neuron
4) A motor neuron carries an impulse to the effector
5) The effector (usually a muscle) responds e.g withdraw a limb away from source of pain

Question 4

Synapses

Answer 4

Gaps between neurones. When an electrical impulse reaches a synapse a chemical is released that diffuses across the gap between 2 neurons. This causes an electrical impulse to be generated in the 2nd neuron