Unit 5 - The Nervous System

Question 1

What happens at each stage during a reflex arc?

Answer 1

Stimulus- change in environment
Receptor- creates nerve impulse in sensory neurone
Sensory neurone- passes impulse to spinal cord
Intermediate neurone- links sensory neurone to motor neurone in spinal cord
Motor neurone- carries nerve impulse form spinal cord to muscle
Effector- muscle stimulated to contract
Response

Question 2

What is the order in a reflex arc?

Answer 2

Stimulus
Receptor
Sensory neurone
Intermediate neurone
Motor neurone
Effector
Response