Observe the blood flow speed, generally venous bleeding, the blood flow speed is slow, and the blood flow speed is fast when the artery breaks and bleeds. It is also possible that the blood supply to the heart and brain is slightly better when lying down than when sitting. There is not much at present. Be sure to take a rest after donating blood! This phenomenon can actually be seen in clinic. It may be that everyone's blood flow speed and blood viscosity are different, but you can also go to the hospital to do an ECG to see the blood supply!

Is blood donation really good for health?

Donating blood means giving one's own blood to clinical transfusion. According to People's Republic of China (PRC) Blood Donation Law, actively participating in blood donation has become a noble and conscious behavior of healthy citizens in China. So, is blood donation really good for your health?

First of all, it has been proved by millions of blood donors in dozens of countries around the world that blood donation is not harmful to health, so it only takes a little courage. The first thing that comes to mind in donating blood is saving lives, which is obligatory. In fact, on the other hand, a large number of scientific studies have proved that while donating love to the society, blood donors have inadvertently improved their physical condition, such as:

1. Improve blood metabolism. Like any living thing, human blood is constantly metabolized. Generally, red blood cells should be updated every four months. Blood donation can stimulate hematopoietic function, promote metabolism, increase new red blood cells and be beneficial to health.

2. Blood donation has a good long-term effect on cardiovascular and cerebrovascular systems, which can prevent and relieve blood viscosity and reduce the occurrence of cardiovascular and cerebrovascular diseases. Regular blood donation reduces a part of the sticky blood in the body, and then through normal drinking water, the blood volume is replenished, so that the blood is naturally diluted, and the blood lipid will be reduced. Insisting on proper blood donation can reduce all components in blood, especially iron and protein, and also reduce blood viscosity and speed up blood flow. With the increase of oxygen supply, people feel relaxed and sober, which can effectively reduce arteriosclerosis, thrombosis, cerebrovascular accident and myocardial infarction.

3. Regular blood donation can improve hematopoietic function. After blood donation, due to the decrease in the number of blood cells, it stimulates the release of mature blood cells stored in bone marrow, stimulates hematopoietic tissue in bone marrow and promotes blood cell production. Regular blood donation within the prescribed time limit can keep the bone marrow vigorous.

4. It can promote and improve mental health. A large number of studies show that healthy emotions can communicate with the brain and other tissues and organs through the nervous system, body fluids and endocrine system, so that they are in a good state, which is conducive to the enhancement of human immunity and resistance. Blood donation is a noble character to save lives. While helping others and being kind to others, it also purifies one's spirit, soothes one's soul and enriches one's work and life. Doing good by virtue actually helps others and yourself, which is an important element of health and longevity.