MICROANATOMY

Detailed explanation-1: -A white blood cell, also known as a leukocyte or white corpuscle, is a cellular component of the blood that lacks hemoglobin, has a nucleus, is capable of motility, and defends the body against infection and disease.

Detailed explanation-2: -Red blood cells do not have a nucleus on maturity. WBCs are characterized by the presence of a large central nucleus.

Detailed explanation-3: -Mammal red blood cells (erythrocytes) contain neither nucleus nor mitochondria. Traditional theory suggests that the presence of a nucleus would prevent big nucleated erythrocytes to squeeze through these small capillaries. However, nucleus is too small to hinder erythrocyte deformation.