Why is it dizzy and golden?

There are nerve cells in the human brain that are responsible for transmitting visual signals. These cells can translate the information of human eyes into birds, trees or anything we see. But after the brain is hit hard, these nerve cells will tremble, and the brain will misinterpret the image like "starry sky". When the back of the brain is severely damaged, it is most likely to see stars, because the "translation system" of the optic nerve is located in the back of the brain. When scientists vibrate the "translation system" of the blind with a probe, images similar to stars will also appear in the eyes of the blind. Patients with periodic migraine often have the illusion of "Venus beating", which is the result of mistranslation due to spontaneous signals generated by the dysfunction of the "translation system". Generally speaking, only when the brain is severely damaged can people see stars, and this phenomenon is harmless to the body. However, if people's brains are slightly or not hit, it's time to see a doctor. If there is a raindrop Venus flying in front of you, or there is a snake-like band image, it is likely that the retina is torn. Treatment should be given as soon as possible, otherwise it will cause partial or complete blindness. When people squat, their lower limbs are in a state of flexion. At this time, the blood vessels in the lower limbs are compressed, blood is difficult to flow to the lower limbs, and ischemia occurs in the lower limbs. When a person who has been squatting for a long time suddenly stands up, the blood vessels in the lower limbs will be unblocked. At this time, it is like suddenly opening the floodgate to release water, and a large amount of blood will rush to the lower limbs. In this way, the blood supply to the head will be insufficient, and the brain will not get enough oxygen and nutrition for a while. Most people will have dizziness and heartbeat, but this phenomenon will soon disappear after the body adapts. The conclusion is that this phenomenon is mostly normal, not caused by anemia. Bian Xiao reminded: 1, people with this phenomenon should not squat for a long time at ordinary times. If they often squat because of work needs, they can prepare a low stool in advance to reduce the flexion of their lower limbs; 2. Stand up slowly after working for a long time to reduce the discomfort caused by it; You should even pay attention to cleaning the workplace to prevent injury after a short period of unconsciousness. 3, usually should participate in physical exercise, enhance cardiovascular function. Why does the person crouch for a long time and stand up and get dizzy? If you squat on the ground for a long time and suddenly stand up, you will often feel dizzy and see stars. This is caused by transient anemia of the head. There are some special situations in the distribution of blood in the body when V squats. First of all, the legs are compressed tightly, the blood vessels are flattened, and the blood reaching the lower limbs is relatively small; Secondly, because the head leans forward slightly when squatting, the blood removed from the head is relatively distributed. When you suddenly stand up, the blood vessels in the lower limbs suddenly relieve the pressure, so a considerable part of the blood flows to the lower part of the body. Moreover, blood also has a certain weight in the body. When you suddenly stand up, due to the attraction of gravity and inertia, a large amount of blood will flow to the lower body, and the blood distributed to the upper body will decrease. In addition, when standing up, the head is upright, so it is difficult to spray blood from the heart to the high head. All these make the blood in the head decrease relatively. The human brain needs blood to supply oxygen most. A short-term decrease in blood supply will make people feel dizzy due to short-term cerebral anemia. In addition, due to the decrease of blood in the head, the blood supply in the eyeball is naturally less, which will lead to dizziness and Venus.