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Human smell is the process by which humans detect and interpret odors. The sense of smell is one of the oldest senses in humans, and is thought to have evolved over 400 million years ago. Humans have the ability to detect thousands of different odors and distinguish between them. This is possible because of the olfactory receptor cells in the nose, which detect molecules in the air and send signals to the brain.

The olfactory receptor cells are located in the olfactory epithelium, which is a small patch of tissue located in the upper region of the nasal cavity. The olfactory epithelium is covered in cilia, which are tiny hairs that help to trap odor molecules. When an odor molecule binds to a cilium, the olfactory receptor cell is stimulated and sends a signal to the brain. The brain then interprets the signal and identifies the odor.

The sense of smell is closely linked to the sense of taste. When food is eaten, odor molecules are released into the air and can be detected by the olfactory receptor cells. These odor molecules are then sent to the brain, which interprets the signal and helps to identify the taste of the food.

Humans also use smell to identify other people. Each person has a unique body odor, which is composed of a variety of chemical compounds that are released into the air. The olfactory receptor cells in the nose detect these compounds and send signals to the brain, which helps to identify the person.

The sense of smell is a complex process that is essential for humans to detect and interpret odors. It is closely linked to the sense of taste and helps humans to identify other people.

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