Why is Human Blood Red?



Simply put, the blood is red because of the presence of haemoglobin. If we look at the blood under a microscope, we will see thousands of tiny cells that looks like a red colored concave dish. If we look at it from the side, these cells will look like a figure eight. The cells were crammed with material called haemoglobin. This haemoglobin carries oxygen around the body. Basically haemoglobin is a protein. Actually, haemoglobin derived from four types of proteins that join together. In the middle of the protein contained an iron ion. Because there are iron so the blood is red.

Red blood cells flowing in the blood vessels. In fact, there are about 35 trillion red blood cells circulating in one circulation in the human body, therefore human blood looks red. When the young red blood cells become mature in the spinal cord, the cells will lose the nucleus and increase the production of haemoglobin. As discussed above, this haemoglobin is the red pigment in human blood.



haemoglobin is a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues


microscope is a mechanical instrument that magnifies the image of small objects.


concave describes an inward curve; while its opposite, convex, describes a curve that bulges outward.


to crowd or stuff people or things into a limited amount of space.


oxygen is a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth’s crust


ion is an atom or particle with a positive or negative electrical charge.


blood vessels is a tube in which a body fluid circulates

spinal cord

spinal cord is a major part of the central nervous system which conducts sensory and motor nerve impulses to and from the brain;


a nucleus is a part of the cell containing DNA and RNA and responsible for growth and reproduction

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