A) 15 trillion
B) 20 trillion
C) 25 trillion
D) 30 trillion
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Answer is option D) i.e 30 trillion
In a normal human body, the total number of red blood cells is approximately 30 trillion.
Women usually have slightly fewer red blood cells than men, while people living at higher altitudes tend to have more red blood cells than those living at lower altitudes. Red blood cells play a critical role in transporting oxygen from the lungs to the rest of the body, and an average human body needs to produce around two and a half million new red blood cells every day in order to maintain its optimal number.