Final answer:
The normal adult male range for RBC is 4.2 - 5.6 million per µL of blood.
Step-by-step explanation:
The normal adult male range for red blood cells (RBC) is 4.2 - 5.6 million per microliter (µL) of blood.
Red blood cells, also known as erythrocytes, are the most numerous cells in the blood and make up about a quarter of all the cells in the human body.
Their main function is to carry oxygen from the lungs to the body's tissues.