What is a sensory receptor?

What is a sensory receptor?

• A. Cells that respond to stimuli in the environment.
• B. Brain neurons that process information.
• C. Muscle spindles.
• D. Blood vessels.

Answer: (A)

Sensory receptors are specialized cells or endings that detect stimuli and convert them into electrical signals that travel to the nervous system. This first step of sensing happens when these receptors respond to changes in the environment—like light, sound, touch, or chemical signals—and initiate the neural input that leads to perception. That idea fits best with describing receptors as cells that respond to stimuli in the environment. Brain neurons, in contrast, are involved in processing and interpreting those signals, not their initial detection. Muscle spindles are a specific type of sensory receptor that detects muscle stretch, but the general concept remains broader. Blood vessels do not serve as primary sensory receptors.

Sensory receptors are specialized cells or endings that detect stimuli and convert them into electrical signals that travel to the nervous system. This first step of sensing happens when these receptors respond to changes in the environment—like light, sound, touch, or chemical signals—and initiate the neural input that leads to perception. That idea fits best with describing receptors as cells that respond to stimuli in the environment. Brain neurons, in contrast, are involved in processing and interpreting those signals, not their initial detection. Muscle spindles are a specific type of sensory receptor that detects muscle stretch, but the general concept remains broader. Blood vessels do not serve as primary sensory receptors.