What is the basic function of sensory neurons in reflex actions?

The basic function of sensory neurons in reflex actions is to carry information to the brain. Sensory neurons are specialized cells that respond to stimuli such as touch, light, sound, and temperature, and they transmit this sensory information from the peripheral nervous system to the central nervous system, which includes the brain and spinal cord.

In the context of reflex actions, this process is crucial because sensory neurons detect specific stimuli, such as a hot surface, and then convey that information directly to the brain for processing. This communication is essential for the body to react quickly and appropriately—like pulling back a hand from a hot stove—often before the information is fully processed by the brain, which is why reflex actions can occur so rapidly.

While it's true that other types of neurons are involved in the overall reflex arc—such as motor neurons that send signals to muscles to initiate movement and interneurons that relay signals within the nervous system—sensory neurons specifically play the foundational role of bringing sensory information into the system, making choice B the most appropriate answer.