Search results: red blood cells

have you ever seen something floating in your vision? it is like a worm or it can also be a transparent water. but strangely, you keep trying to see more clearly, it disappears

a person with type ab blood can be considered quite rare. so why are so few people carrying this blood group?

we all know that human blood is red, but the veins under the skin are green. it is due to the light reflection of the skin, the amount of oxygen in the blood and other factors.