MICROANATOMY

Detailed explanation-1: -Unlike most other eukaryotic cells, mature red blood cells don’t have nuclei. When they enter the bloodstream for the first time, they eject their nuclei and organelles, so they can carry more hemoglobin, and thus, more oxygen. Each red blood cell has a life span of around 100–120 days.

Detailed explanation-2: -Do erythrocytes have a nucleus? While immature red blood cells contain a nucleus, mature human red blood cells do not. During the maturation process, red blood cells expel their nuclei as well as other organelles.