The answer to three obvious things: human body temperature is stable at 37 degrees C, when sneezing and closing eyes and appendix

Let's find the answer to 3 obvious things of human: our body temperature is always stable at 37 degrees C, when sneezing, we always close our eyes, the appendix has "excess" through the following article.

1. Why do human thumbs only have 2 burns?
2. What happens inside the human body when it is about to drown?

1. Why is human body temperature always stable at about 37 degrees C?

All humans on Earth, though different in weight, height, age, gender, and habitat, share the same characteristic that their body temperature is always around 37 degrees C. Why 37? C degree but not other numbers?

Humans in particular and mammalian families in general possess great abilities that are able to maintain their body temperature at a stable level. The amount of heat produced is controlled by the brain to balance the heat excreted into the environment.

According to scientists, with the current climate and habitat on Earth, 37 degrees Celsius is the temperature suitable for the body's heat production and dispersal rate to accommodate all kinds of weather, Helping the brain and organs work best. In order to maintain body temperature at about 37 degrees Celsius, the body must use a lot of energy.

2. Why do people close their eyes when sneezing?

Sneezing is a high-level defense mechanism of the human body, protecting the nasal passages from foreign molecules or objects. When people sneeze, the air is squeezed and pushed out from the lungs at very high speeds of about 4.5m / s.

When stimulated, the nerve center controls all contraction muscles, from the esophagus to the sphincter, including the eyelid muscles. This makes our eyes always closed when sneezing, even some people have tears in their eyes.

Two hypotheses are proposed by scientists to explain this issue.

1. To protect the nose and eyes. About 100,000 bacteria will be released at a tremendous speed of 4.5m / s, closing your eyes when sneezing will prevent bacteria and foreign particles from entering and irritating your eyes.
2. Close your eyes when sneezing shows the interconnection of body parts.

3. Why do people have appendix?

The appendix is ​​considered to be a useless part of humans, moreover it can be dangerous if inflamed and broken into the abdomen. So why do we own such a "useless" part?

According to scientists, the appendix, like wisdom teeth, is one of the vestiges of human evolution from ancient gibbons. The appendix is ​​the part used to digest the leaves of ancient primates, but when people's living habits change from change, its main function gradually dissipates and survives to this day.

Scientists believe that the appendix still has a role to play, where it contains many white blood cells against infectious diseases and supporting the small intestine.