Hair protects the fragile top of the head, armpit hair protects sweat glands that are not suitable for blowing under the armpit, and hair protects pores. Hair has its own parts that need protection.
The role of hair:
Beauty function: having a bright black hair, neatly trimmed and transparent, giving people a unique, elegant and beautiful enjoyment when presenting it to everyone; On the contrary, if it is fluffy and dirty, it will give people an unpleasant sense of party.
Protection: thousands of hairs are wrapped around the head, naturally forming the first line of defense of the head. Thick, healthy and clean hair can protect the head from external machinery and bacteria, which plays an important role in fitness.
Sensory function: Hair is sensitive. When the external environment has an impact on the human body, regardless of the wind and rain, or the sun and rain, the first thing you feel is the hair, and the information it sends is transmitted to the brain, thus taking various protective measures.
Regulation: Hair can regulate body temperature. In winter, cold wind blows, blood vessels contract, and hair can keep the head warm; In summer, the sun is scorching, blood vessels dilate, and hair can dissipate heat. Therefore, hair has dual functions of heat preservation and heat dissipation. Hair is a kind of fibrous tissue that grows on the scalp, and it is an arrangement of hard keratin formed by cell regeneration. Hair consists of two parts: root and stem.
The role of eyebrows:
Eyebrows are a barrier to protect the eyes, which can prevent the erosion of rain and sweat. The eyebrows form a barrier above the eyes, and the wind can block the dust; When it rains lightly, stop the rain from flowing into your eyes. In summer, there is a lot of sweat on my forehead, but the sweat will not flow into my eyes, which is also the credit of my eyebrows. In addition, eyebrows can also strengthen expressions, reveal mood and personality, and reflect health status.
The role of the beard:
The human beard is "hair" rather than a beard. Mammals are characterized by long hair on the body surface, which can be roughly divided into ordinary body hair and beards on the faces of mice, cats and other animals. Animal beards have the functions of measuring and feeling.
Every beard of animals is connected with muscles, but this part of human muscles basically disappears with the beard, leaving only a small number of expression muscles, which are distributed around eyes, nose and mouth. Due to the degeneration of the beard, the muscles used to move the beard in the past have been transformed into expression muscles today. Although human beings have lost their beards, as compensation, their facial expressions are getting richer and richer.
In addition to men's personality traits, beards also have the characteristics of adsorbing harmful substances.
Men after puberty generally have beards. This is the result of androgen. The more vigorous the reproductive function, the faster the beard grows. Beard has more blood vessels than hair roots, and nutrients are easy to obtain. Therefore, the beard that has just been shaved will grow back in a few days.
Recently, foreign experts found that beards have the characteristics of adsorbing harmful substances. When people breathe, they can discharge a variety of harmful chemical gases, all of which can stay on their beards; The atmosphere contains a variety of heavy metal particles, especially in busy streets, polycyclic aromatic hydrocarbons and lead emitted by automobile exhaust will also be adsorbed by beards; Smokers, carcinogens such as benzopyrene in smoke, will also stay on their beards. In addition, the epidermal oil of long beard is secreted more, so it is often difficult to wash your face with water at ordinary times. Studies have shown that oil has the property of adhering to dust and microorganisms.
Foreign experts analyzed the shaved beard with gas chromatograph and found dozens of harmful substances, such as carbon dioxide, nitrogen oxides, benzopyrene and lead. Under the microscope, you can also see a large number of microorganisms on the beard.
It can be clearly seen from the shape of beard and respiratory airflow that the function of beard is to absorb harmful substances and prevent inhalation, and there is almost no obstacle to exhaled gas.
Historically, men have generally exercised much more than women, and men need beards more, which is basically the case now. Women also have beards, and scientific research shows that there are five grades of gender, so it is not surprising.
At the same time, beard is one of the gender symbols of men, and it is also the embodiment of the charm of mature men. China has a saying that "no hair on your mouth, no practical work". Scientifically speaking, it is proved that men secrete more hormones and do more things. Men's beards have also been given a deeper meaning. After cutting it off, the sign is gone, and a bar is missing.
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