. What are reflex actions? Give two examples. Explain a reflex arc.
Answer: The sudden involuntary movement in a voluntary organ; in response to a stimulus; is called reflex action.
Examples of reflex action:
(a) Moving your hand away from a hot iron plate
(b) Blinking of eyes
Reflex arc is a path of electrical impulse during a reflex action. It is composed of sensory neuron, spinal cord, motor neuron and muscle.
Steps of reflex arc
• The sensory neuron picks signals from the stimulus and carries the signals to the spinal cord.
• Spinal cord process the signals and sends a message through the motor neuron.
• Motor neuron transmits the signals to the effector muscle so that the muscle can take immediate action.