the human body is a great machine filled with various chemicals, and its parts can cooperate accurately. It can produce many things, from sweat to memory. It has many secrets you don’t know.
1. Your skin has four colors
. Your skin may be milky white. Blood vessels in the epidermis add red to the skin. Yellow also complements the background color. Finally, there is black to deal with ultraviolet rays. These four colors are mixed in different proportions to produce the skin color of all people in the world.
a tribe in Africa uses crocodiles as totems. They hook wounds similar to crocodile skin on their skin.
2. Laughter can also infect
just as yawning can infect, the latest evidence shows that laughter can also infect. In fact, hearing laughter does stimulate areas of the brain related to facial expressions. In social communication, imitation plays a very important role. Sneezing, laughing, crying and yawning may be a way to establish social relations.
3. The head assembly causes the evolution of small mouth
to be sometimes imperfect. If something goes wrong, maybe we will have wings instead of wisdom teeth. Sometimes useless tissues remain in the species because they are not harmful. In the early days, wisdom teeth were used as molars for the third batch of broken meat. However, the growth of the brain led to changes in the structure of our mandible, making our mouth very narrow and crowded.
compared with the “mouth” of snakes, the human mouth is much smaller in the process of evolution.
4. Cell cilia in the nose discharge snot
there are many cells called cilia in our body, which are helpful to the function of many of our organs. In the nose, cilia can help discharge snot from the nasal cavity to the throat. Cold weather can slow down this excretion process, leading to mucus blockage and continuous runny nose.
5. Adolescent remodeling of brain structure leads to emotional agitation
we know that changes in hormones in the body can promote growth and prepare for childbirth, so why is adolescence always so emotional irritability. In fact, hormones such as testosterone affect the development of neurons in the brain, and their changes can reshape brain structure, resulting in many behavioral changes.
6. Thousands of eggs are not used by ovaries
when a woman is about 50, the monthly menstruation that controls hormones and fertility gradually disappears. Her ovaries produce less and less estrogen, and her immature eggs are no longer regularly discharged into the uterus as before. On average, a young woman has 34000 undeveloped follicles. However, only 350 follicles mature in her whole life. Unused follicles begin to degenerate, then they can no longer conceive, and the brain will control to stop ovulation.
7. Eating is mainly to provide energy for the brain.
the brain only accounts for 2% of the weight of our whole body, but it needs 20% of the oxygen and calories of the human body. To ensure that our brain has enough energy, the three main cerebral arteries continuously deliver oxygen. If one of the arteries stops or blocks slightly, it will deprive brain cells of energy and destroy the work there. This is what we call a stroke.
8. Bones can decompose and balance human minerals
research shows that our human bones can not only support the body and muscles, but also regulate our calcium content. Bone contains phosphorus and calcium. When the calcium content decreases, specific hormones will decompose the bone and increase the calcium content of the bone until the necessary standard is reached.
9. Body posture affects your memory
do you remember your wedding anniversary, honey? Propose to me on your knees. Memories are deeply imprinted on our senses. A smell or a sound can evoke the memories of our distant childhood. This connection can be obvious or unpredictable. For example, a bicycle bell can awaken a memory of the past. A recent study explains this. According to an article published in the journal cognition in January 2007, when a person’s body posture is similar to the impressive posture at that time, it can awaken memory faster and better.
10. The mysterious corrosive acid in your stomach
in fact, each of us carries a dangerous liquid. Even the airport security check can’t take it away from you, because it exists in your internal organs. It is the hydrochloric acid in your stomach, which is often used in industry to treat metals. It can be used to chromate steel. In our stomach, we can safely store this venom in our digestive system and decompose the food in your stomach.