nervous system

Question 1

describe the process of an action, the response to a stimulus

Answer 1

stimulus affects the receptor which sends signals across the sensory neurone and then the relay neurone, travelling across the synapse using neurotransmitters, up the spinal cord, up to the brain then comes back down through a motor neurone to an effector (usually muscle)

Question 2

describe the structure of a neurone

Answer 2

axon, myelin sheath which speeds up signals, dendrites on the end

Question 3

what are stimulants/depressants

Answer 3

either speed up or slow down crossing of synapse

Question 3

what is a reflex

Answer 3

a reaction that bypasses the brain and goes receptor –> spine –> effector

Question 4

practical for reaction time

Answer 4

ruler, drop it and catch it, add distractions or energy drinks, etc