oxyhemoglobin

Oxyhemoglobin is a form of hemoglobin that has loosely combined with oxygen. Hemoglobin is an iron-containing protein found in red blood cells that is responsible for transporting oxygen from the lungs to the body's tissues. When hemoglobin is carrying oxygen, it is bright red and is called oxyhemoglobin. When it releases oxygen to the tissues and returns to the lungs, it becomes a purplish-blue color.12

The amount of oxygen bound to hemoglobin depends on the oxygen levels in the lungs. Hemoglobin's ability to bind oxygen is influenced by factors such as pH and the concentration of certain molecules within red blood cells. This protein plays a vital role in respiration, ensuring that cells receive a continuous supply of oxygen necessary for survival.34