At the root of the hairs distributed over the entire surface of the skin (with the exception of the genitals, the palms of the hands and the soles of the feet) there is an erector hair muscle. When it is cold, this muscle contracts to make the hair stand on end, striving to create a layer of air around us that insulates us from the cold outside.
Yawn Maybe it's because your brain is on fire. According to a study led by Princeton University researcher Andrew Gallup, yawning is not just an indicator of fatigue or boredom. In fact, Gallup has shown that how often we yawn varies depending on the season of the year.
They do this at a rate of 4 centimeters a year, at least twice as fast as toenails. This is because those of the hands suffer more wear, since they are used, for example, to open cans, boxes or objects, and also to scratch.
The skin is damaged by ultraviolet (UV) radiation from the Sun. Shorter wavelength (UV-B) rays have more energy and are more damaging, but both UV-B and UV-A rays can cause burns, skin cancer and premature aging.
The size of female breasts is determined in part by genetic inheritance and in part by environmental factors, such as diet, exercise, and hormonal imbalances. The breasts begin their development at puberty and conclude between 5 and 9 years later. In this period, the breasts become globose and spherical, due to the growth of the mammary glands and the accumulation of fat.
Tomorrow ends in Barcelona the meeting of the second study group of the Virtual Physiology Human Network of Excellence, a European network of excellence that for five years has coordinated a series of activities related to the development of the Virtual Human Being.
The cells of the skin covering the body are renewed every 20 or 30 days. That means that throughout life we release skin around ... a thousand times! But such molts only affect the epidermis.
Danni Büchner is invited to Sam Dylan's Halloween party. But the "Goodbye Germany" emigrant has no desire for many other party guests. And find clear words.
