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Senses

Senses help us to perceive our environment:

Sight

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Smell

Touch

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Why do some smells trigger memories?

The scent of freshly cut grass can remind you of summer or the smell of a logfire can trigger memories of a winter’s day. This is because the olfactory bulb—which transmits

Information about smells detected 4 in your nostriis—is connected to the parts of the brain that 4 process emotion and memories.

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FAST FACTS

Odors

01: Chemicals that are volatile (can easily tum into a gas) give off molecules, or odors, that are released into the air.

02: Substances such as salt and sugar have strong tastes but are odorless because they are not volatile and do not evaporate into a gas.

03: Perfumes contain a variety of Chemical compounds that evaporate easily.

How to: smell

04:

The gas used to cook and heat some homes is odorless, so a smelly Chemical is added to it so that people can detect gas leaks easily.

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People who cannot smell have a condition called anosmia.” Some people are bom with anosmia, while others develop it later in life.

Secrete watery mucus from the glands beneath the epithelium to help dissolve the odors.

02.

01 ■ Breathe in air and collect the odors arriving in your nostriis on your olfactory epithelium—a patch of tissue on the roof of your nasal cavity packed with receptor cells.

Olfactory bulb:

Carries nerve impulses to the brain

Olfactory epithelium: Collects smells arriving in the nasal cavity

Nasal cavity:

Chamber where incoming air is warmed or cooled to body temperaturę

Nerve fibres: gather data from taste buds, which may help identify a smell

(c) 2011 Dorling Kindersley. Ali Rights Reserved