👉 Erythrocytic is a biological term that describes a type of red blood cell, specifically a red blood cell. This type of red blood cell is composed primarily of hemoglobin and contains two proteins: ferritin and haemoglobin. Hemoglobin is responsible for carrying oxygen from the lungs to the body's tissues, while haemoglobin serves as a carrier of iron, which is essential for the production of red blood cells and the formation of red blood cells. Iron is also used in