Reflex Arcs and Their Importance in the Nervous System

This video tutorial explains reflex arcs, which are neuron pathways enabling reflex actions. Reflex actions are automatic responses to stimuli that bypass the brain, allowing quick reactions to danger. Using the example of touching a hot pan, the video details the flow of a reflex arc, involving receptor cells, sensory neurons, the spinal cord, relay neurons, motor neurons, and effectors. The video concludes by discussing various reflex actions, such as eye blinking, and emphasizes the protective role of reflex arcs in the nervous system.

What is the primary function of a reflex arc?

• To enhance sensory perception

• To provide a quick response to stimuli

• To enable conscious decision-making

• To process information in the brain

Which part of the nervous system does the sensory neuron transmit impulses to in a reflex arc?

• The muscles

• The heart

• The spinal cord

• The brain

In the reflex arc pathway, what role does the relay neuron play?

• It connects the sensory neuron to the motor neuron

• It detects the stimulus

• It transmits impulses to the sensory neuron

• It acts as the effector

What happens when the motor neuron receives an impulse in a reflex arc?

• It transmits the impulse to the brain

• It sends the impulse back to the sensory neuron

• It activates the effector to respond

• It stores the impulse for later use

Which of the following is an example of a reflex action?

• Thinking about a math problem

• Blinking when an object approaches the eye

• Listening to music

• Deciding to move your hand