Reflexes

Question 1

What is a reflex?

Answer 1

a rapid response to a stimulus without conscious control

Question 2

What is the process of a response to stimulus?

Answer 2

stimulus - receptor - sensory neuorne - relay neurone - motor neurone - effector

Question 3

Give an example of a stimulus and effector

Answer 3

stimulus = object approaching eye

effector = muscle - orbicularis oculi muscle

Question 4

What are the advantages of a reflex?

Answer 4

helps organisms avoid damage
very fast - you don’t even need to think about it
doesnt need to be learned - protects infants e.g. blinking, knee jerk reflex

Question 5

What is the knee jerk reflex?

Answer 5

straightens your leg if your quadraceps are stretched
helps to keep your balance
stretch receptors detect stretch - nerve impulse to along sensor neurone - to motor neuorne and then effector