Ears and hearing-
putting a seashell to our ear, we hear the sound of blood pulsing in our veins, and not the sound of the surf; ears continue to grow throughout life; the human ear can distinguish up to 4000 sounds of different frequencies; after a heavy meal, our hearing becomes dull;
the best sound background for a person is up to 50 decibels (calm communication). All sounds exceeding this threshold overload our body and reduce immunity; babies are able to hear sounds up to 20,000 hertz, while adults only up to 15,000 hertz.
Tongue and taste-
about 5000 taste buds are concentrated on the surface of the tongue;
16 muscles provide mobility to the tongue;
The imprint of each tongue is unique, like fingerprints;
by the color of the tongue, the doctor is able to identify a number of different diseases.
Nose and smell-
there are up to 11 million olfactory cells in the nose; the nose continues to grow throughout life; if necessary, a person can breathe with only one nostril; pleasant aroma helps to relax the human central nervous system; every 50th inhabitant of the planet has no or extremely poor sense of smell;
The human nose distinguishes about 50,000 smells, while the dog's is millions of times more sensitive.
Skin and touch-
A component such as melanin is responsible for skin color. The less melanin, the lighter the skin; albino - a person who lacks melanin; the sense of touch in a person arises first, and disappears last;
most often, insects bite the skin on the legs; the top layer of the skin is completely renewed every month; the thickest skin on the feet; the thinnest skin on the eyelids and in the eardrum; about half a liter of fluid per day is excreted from our body through the skin;
the dust in the room consists largely of the remnants of keratinized skin.