In winter, outdoor people often find their noses cold and their ears red with cold. If they are not careful, they may freeze. The human body, that is, these two parts are most afraid of cold, which is why people are warm-blooded animals, and the temperature of their bodies is often maintained at around 37℃. When the outside air temperature is too low, their body's heat will dissipate quickly, and they will feel cold. If the temperature is below 0℃ and you don't keep warm, the blood will coagulate and the tissues of your body will freeze. To this end, in winter, people put on thick clothes, cotton shoes and hats to keep the normal temperature in their bodies. And facial organs, eyes need to see things, ears need to listen to sounds, nose and mouth need to breathe and talk, and they can't be wrapped tightly, so it is naturally difficult to keep warm.

Secondly, the nose and ears are more prominent, and the contact surface with the air is large, and the heat is easy to dissipate, especially the ears, which are thin and radiate when they contact the air. Compared with the nose, ears are more likely to freeze.

In addition, the heat of various organs of the human body is transmitted through blood circulation. When blood flows out of the heart, the temperature is higher, and the more it flows out, the temperature gradually decreases. The nose tip and ears are at the end of blood circulation, where the blood flows at a lower temperature, so less heat is transported. Coupled with the fact that heat is easy to radiate and it is difficult to keep warm, the nose tip and ears are most afraid of cold.