Question

how is smell detected ??
(3 marks question)
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Answer 1

This is how smell is detected :-

• The nose recieves a stimulus (odour of something ; fragrance of a flower for example)

• The olfactory cells situated near the top of the nasal cavity transfer the stimulus to the brain in the form of nerve impulses.

• The Olfactory bulb, a group of neurons (aka the smell centre of the brain) recieves the nerve impulses, processes them and recognises the odour.

Answer 2

Answer:

Humans detect smells by inhaling air that contains odor molecules, which then bind to receptors inside the nose, relaying messages to the brain. Most scents are composed of many odorants; a whiff of chocolate, for example, is made up of hundreds of different odor molecules.

Explanation:

---How is smell and taste detected?

Both smell and taste use chemoreceptors, which essentially means they are both sensing the chemical environment. This chemoreception in regards to taste, occurs via the presence of specialized taste receptors within the mouth that are referred to as taste cells and are bundled together to form taste buds.

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