Question

There are about 4 million red blood cells (RBCs)
in a microliter of human blood. An adult human
has around 5 liters of blood in their body. Based
on these numbers, roughly how many red blood
cells are in the body in scientific notation?

Answer 1

Answer:

20,000,000,000

Explanation:

Adult humans have roughly 20–30 trillion red blood cells at any given time, constituting approximately 70% of all cells by number. Women have about 4–5 million red blood cells per microliter (cubic millimeter) of blood and men about 5–6 million; people living at high altitudes with low oxygen tension will have more.