Same chapter3 marksDifficulty: Medium
Distinguish between a sensory, a motor and a relay neuron.
Nervous System
3 marksDifficulty: Medium
Define a reflex action and describe the path of the reflex arc when the hand touches a hot object.
Original Khojo Papers practice question — not from a past board paper.
Answer
A reflex action is a rapid, automatic response to a stimulus that does not involve the will. The receptors in the skin send an impulse along a sensory neuron to the spinal cord, where a relay neuron passes it to a motor neuron, which carries it to the muscle of the arm, and the hand is pulled away.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
The brain is informed afterwards, which is why the pain is felt after the hand has already moved.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
What is a synapse, and how is an impulse carried across it?
Nervous System
Same chapter3 marksDifficulty: Medium
Name the three parts of the human brain and state one function of each.
Nervous System
Same chapter3 marksDifficulty: Medium
Draw a labelled diagram of the human eye and name the part that changes the focal length of the lens.
Nervous System
Same chapter3 marksDifficulty: Medium
State three differences between the sympathetic and the parasympathetic nervous systems.
Nervous System
Same chapter3 marksDifficulty: Medium
Distinguish between a conditioned and an unconditioned reflex, with one example of each.
Nervous System