Reflex arc

The video explains the knee jerk reflex, detailing how a reflex arc operates with minimal components, including sensory and motor neurons. It highlights the efficiency of bypassing the brain for faster reactions.

What happens when the knee is tapped just below the kneecap?

• The leg jerks upwards.

• The leg remains still.

• The foot moves sideways.

• The leg bends backwards.

Which of the following is NOT a part of a simple reflex arc?

• Sensory neuron

• Interneuron

• Motor neuron

• Cerebral neuron

In a reflex arc, where does the sensory neuron send the signal first?

• To the heart

• To the muscles

• To the spinal cord

• Directly to the brain

What is the role of the motor neuron in a reflex arc?

• To send signals to the heart

• To activate a muscle response

• To connect to the brain

• To detect the stimulus

Why do reflex arcs bypass the brain?

• To avoid pain

• To produce a quicker reaction

• To produce a slower reaction

• To save energy