![]() ![]() What percentage of red blood cells should people have in their body? White blood cells, or leukocytes The expected number of red blood cells in a single drop (microliter) of blood is 4.5–6.2 million in males and 4.0–5.2 million in females. The human body produces around 2 million blood cells every second. ![]() The life span of a red blood cell is 4 months, and the body replaces them regularly. Hemoglobin is a protein that contains iron and carries oxygen to its destination. They transport oxygen to and from the lungs. Red blood cells have a slightly indented, flattened disk shape. Each of these has a vital role to play in keeping the blood functioning effectively.įind out what plasma donation involves. The remaining 45% of blood mainly consists of red and white blood cells and platelets. Plasma is 92% water, and the contents of the remaining 8% include: Plasma accounts for around 55% of blood fluid in humans. Share on Pinterest Micro Discovery/Getty Images ![]()
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