Why is blood red?
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Blood contains protein called hemoglobin. Hemoglobin contains iron and transports oxygen when it is needed. To understand why blood is red, you can, having understood its composition. The blood contains red blood cells that color it in shades of red.
Differences in color saturation caused by changes in oxygen content. Arteries transport blood to every organ of the body. Thin capillaries distribute not only oxygen, but also other useful substances into cells.
Oxygen enters the lungs along with the inhaled air. The small bronchi end with a large number of pulmonary vesicles with thin walls. Gas exchange is made in them. Oxygen contained in the alveoli, enters the bloodstream, saturating it, and harmful carbon dioxide takes its place. Dark blood, enriched with oxygen, becomes scarlet and becomes arterial.
Now you know why the blood is red.The necessary oxygen to the body will combine with hemoglobin, located in the red bodies - red blood cells. Pure blood that has entered the heart muscle is pushed into the vessels of the systemic circulation, moving through which nourishes organs and tissues.