Question

Explain reflex action? [5 MARKS]

Answer 1

Explanation: 2 Marks
Diagram: 3 Marks

1. Reflex actions are sudden involuntary responses which does not involve thinking.
2. For example, when we touch a hot object, we withdraw our hand immediately without thinking. The sensory nerves that detect the heat from the receptors in the skin are connected to the nerves that move the muscles of the hand. Such a connection of detecting the signal from the nerves (input) and responding to it quickly (output) is known as the reflex arc. Reflex arcs are formed in the spinal cord but the information is still sent to the brain.