Question

______ are receptors that can respond to painful stimuli.
○ chemoreceptors
○ photoreceptors
○ nociceptors
○ mechanoreceptors

Explanation:

To solve this, we analyze each option:

• Chemoreceptors: Respond to chemical stimuli (e.g., taste, smell), not pain.
• Photoreceptors: Respond to light (e.g., in eyes), not pain.
• Nociceptors: Specialized to detect painful stimuli (noxious stimuli).
• Mechanoreceptors: Respond to mechanical forces (e.g., touch, pressure), not pain.

Answer:

C. Nociceptors