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Taste in humans

Taste can be analyzed into four principles: sweet and bitter
Sour, salty...

The tongue may be affected by all of them, some or all of them, and sense a taste that is not, of course, pure sweet, nor pure salt, nor bitter, nor sour, but rather it is the result of the combination of these tastes. Perhaps an example of this is lemonade, as it is sweet and sour, and may contain a little bitterness and a little salt.

-Taste sensations:

Taste sensations are found in the mouth, especially on the tongue. It is also found in the pharynx, larynx and the roof of the mouth. And in the uvula. In children, it is also found in the cheeks and lips, in the gums and on the lower side of the tongue.

- Taste buds:

Taste Buds are located particularly on the upper surface of the tongue, at its tip, on its sides, and at its back.

The shape of the bud is oval, and its dimensions are 40 microns x 8 microns. A macron is one-thousandth of a millimeter. These buds are connected to the ends of the taste nerves, which eventually reach the brain. Many of these buds do not appear on the surface of the tongue, but rather are found in a descending gap between the visible papillae of the tongue.

- Weakness of taste with age:

Taste weakens with age.
They found that a person, from childhood to the age of twenty or so, has about 245 buds around some of the nipples of his tongue. They found that it decreases to 88 buds between the ages of 75 and 80, and that many of them lose their function.
Children have twice as many sprouts as adults, and therefore they have a greater taste for things than adults.

Perhaps for this reason, children accept the foods that food factories make for them and have the same taste, and parents taste them but do not find in them the taste that children find with their abundance of sprouts.

- There is no taste except for the thing that dissolves:

It is not an obvious statement like this.
The sugar dissolves.
And the salt dissolves.
Vinegar is a dissolved liquid.
It is the dissolved part of these things that affects the buds
Taste. As for the solid that does not melt, its action does not reach it, and it has no taste. He is like stone and like iron.

No one knows how taste buds sense these different sensations.

The four tastes and their positions on the tongue:

As for sweet, I feel it in a place on the tongue, the tip of it, in it
The buds are the most sweet.

As for salt, it is the place where it is felt on the tip of the tongue
And its letters.

As for acid, the place that feels it most is the side of the tongue
And their letters.

As for bitterness, the place where it is felt is the back of the tongue, as well as the pharynx.

As for the middle of the tongue, there are no buds in it, so if anything touches it
It has a taste that has never been tasted.

The tongue does not sense the four tastes
One degree:

The tongue senses sweet sugar and its concentration is one part in two hundred in water

The tongue senses salt and its concentration is one part in 400 in water.
The tongue feels the acid and its concentration is one part in 30,000
part in water.
The tongue senses bitterness, and its concentration is one part in 2000000 parts
In the water .

The nose is more sensitive in its smell than the tongue in its taste. The nose may smell the air and it contains one part in a thousand million parts of this air of the smelling substance.