38.  What are reflex actions? Give two examples. Explain a reflex arc.

The sudden involuntary movement in a voluntary organ; in response to a stimulus; is called reflex action.

Examples of reflex action:

• Moving your hand away from a hot iron plate
• Blinking of eyes

Reflex Arc.

The reflex arc is a path of electrical impulse during a reflex action. It is composed of sensory neurons, the spinal cord, motor neurons and muscles.

Steps of the reflex arc

• The sensory neuron picks signals from the stimulus and carries the signals to the spinal
• Spinal cord process the signals and sends a message through the motor
• Motor neuron transmits the signals to the effector muscle so that the muscle can take immediate