What is the Approximate Number of Red Blood Cells in One

Question

What is the approximate number of red blood cells in one cubic millimeter of blood?
A) 1 million
B) 3 million
C) 5 million
D) 7 million

Accepted Answer

On average, there are about 5 million red blood cells (also known as erythrocytes) per cubic millimeter of blood in a healthy human body.