Posted on Feb 27, 2021 121
Interesting facts about red blood cells
1. June 14 is World Donor Day, which commemorates the birthday of Karl Landsteiner, the Austrian scientist who first divided blood into groups.
2. The body of an adult contains about 6-8% blood of the total body weight. The average amount of blood in the body of a child is slightly higher and equals 8-9%.
3. Blood moves through the human body at different speeds. It moves fastest through the arteries at 1.8 km per hour.
4. 74-year-old Australian James Harrison donated blood almost a thousand times during his life. Thanks to Harrison’s donations, it is estimated that approximately 2 million infants have been saved!
5. When a large vessel is damaged, death comes faster, but not from blood loss, as you might think, but from the rapid decrease in blood pressure and the lack of oxygen to the brain and myocardium.
6. A person can live normally if the blood does not travel through the blood vessels in a jerky manner, but in a continuous flow. This was proven by the doctors of the American Craig Lewis, who was dying of heart disease - his life was not saved even by an electronic pacemaker. As a result, he had his heart removed, but was hooked up to a device that helped blood circulate through his body uninterruptedly. Lewis lived for 5 weeks with literally no pulse, and his ECG was isolinear the whole time! He died due to liver failure because of amyloidosis, which was not related to the machine being hooked up.
7. It is believed that women, on average, are much less afraid of blood than men. This is due to the fact that women have to see their menstrual blood regularly.
8. Some species of toad lizards at an explicit threat from a predator, “turn on” a unique defense mechanism: they shoot at him with their blood from the corners of the eyes at a distance of up to 1.5 meters!
9. In the waters of the Antarctic live ice fish, also known as Icefish. This is the only species of vertebrates that have no red blood cells or hemoglobin, so the blood of icefish is colorless. Their metabolism runs only on oxygen, which is dissolved directly in the blood. This unusual structure of the circulatory system allows Icefish to exist in habitats with temperatures below 0 degrees Celsius.