Hemoglobin:A protein in red blood cells responsible for transporting oxygen from the lungs to the rest of the body.
Erythrocytes:Also known as red blood cells, they are the most common type of blood cell and primarily function in transporting oxygen and carbon dioxide throughout the body.
Oxygen saturation: A measure of how much oxygen is bound to hemoglobin in the blood, indicating how effectively blood can carry and distribute oxygen throughout the body