How do we perceive scent?

• A. The orthonasal and retronasal passage
• B. Through the ears
• C. Through the skin
• D. Through the taste buds

Answer: (A)

Scent is detected by the olfactory system through two pathways: orthonasal and retronasal. Orthnasal perception happens when odor molecules enter the nose from the outside and bind to receptors in the olfactory epithelium, sending signals to the brain. Retronasal perception occurs as odors from the mouth rise up to the nasal cavity during eating, contributing to how we experience aroma alongside flavors. The brain processes these olfactory signals to create the sense of smell. The ears handle hearing, the skin handles touch, and the taste buds handle taste; none of these alone explains how we perceive scent, though smell and taste together shape flavor.