YOUR SENSE OF SMELL, also known as olfaction, is the other sense that can detect chemicals in your environment. You are able to pick up on them as they float in the air and into your nose. Like taste, smells can be either pleasant or might help you avoid unsafe foods, drinks, and environments. Smell can allow you to enjoy the aroma of a freshly baked cookie or alert you of smoke from a fire. Some smells may trigger a memory, helping you remember people and places from the past.

When the chemicals from the environment enter your nose, they dissolve in a layer of mucus on the olfactory epithelium, which is a membrane in your nose. When you pinch your nose closed, the airflow to the receptors in your nose is blocked, which is why ...

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