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Learn Science [Form 2]

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This book is not a story. This book is a study book for those who likes to study science. I put this way for those who are so lazy to study in their actual books. So, yeah. Hope this book helps you for your knowledge about science. Actually, the les...

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Chapter 1 - Lesson 3

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by CutieKittyMe

by CutieKittyMe

CHAPTER 1: THE WORLD THROUGH OUR SENSES

1.3 The Sense of Smell

Structure of the nose

The nose is the sensory organ for smell. The upper part of the nasal cavity of the nose has many sensory cells or receptors to detect smell. These smell receptors are sensitive to all kinds of smells.

Detection of smells

Certain chemical particles present in the air circulate the smells in the air. For example, flowers, food and perfumes release chemicals into the air.

When these chemical particles enter the nasal cavity, they dissolve in the mucous lining that coats the smell receptors in the nasal cavity. The dissolved chemical particles stimulate the smell receptors. The smell receptors then send out nerve impulses to the brain. The brain identifies the smell.

Structural adaptations of the nose to detect smells:
◆ Smell receptors are located at the roof of the nasal cavity. This enables the receptors to have maximum exposure to the air that enters the nasal cavity.
◆ The smell recptors are always covered in moist mucus which is secreted by the glands in the nasal cavity.

◆ The smell recptors are always covered in moist mucus which is secreted by the glands in the nasal cavity — Oops! This image does not follow our content guidelines. To continue publishing, please remove it or upload a different image.

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Figure 1.6 How smells are detected

When a person has a cold, he is unable to detect smells well. This is because too much mucus is being produced. The mucus prevents the chemicals from simulating the smell receptors.

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Hey. Well, if there is any problem about the picture like if it is blurred or something, don't hesitate to tell me. I'll try to fix the problem. Just say it nicely and politely. Okayy? =)

~ CutieKittyMe