B3.1.2 Reflexes

Question 1

Define reflex action

Answer 1

Involuntary, coordinated response to a stimulus that protects the body by bypassing through brain

Question 2

Define voluntary action

Answer 2

Movement controlled consciously by the brain

Question 3

Describe reflex arc of touching a hot candle

Answer 3

Stimulus of heat from candle flame
Temp detected by heat receptor in skin
Sensory neurone passes nerve impulse to spinal cord
Relay neurone passes impulse across spinal cord
Motor neurone passes impulses to bicep muscle
Effector (bicep) contacts
Response is the hand is moved from flame