The structure and function of Red Blood Cells
Red blood cells (RBC) are produced in our bones. our bones reproduce them constantly because red blood cells only have a life span of 120days. The cells become worn out and die. They are the primary cells in our body as their function is too deliver oxygen to our cells and remove carbon dioxide and other waste materials.
RBC have biconcave discs this means that the centre of both sides of the cell is depressed. The depressed centre allows the cells to have more cell membrane surface to allow the diffusing of oxygen and carbon dioxide to take place. This shape also allows for the RBC to have a large surface area for oxygen. Due to the structure of the RBC they are more flexible than other cells and they can squeeze through tight passages such as capillaries between cells in tissues. They can also bend and return to their original shape.
RBC contain a protein chemical called hemoglobin. This protein gives the cells their 'red' colour. Hemoglobin also contains iron. When a red blood cell is first produced it has a nuclei. As it matures it loses the nuclei, this is to allow more space for the haemoglobin so that it can carry as much oxygen as possible. As the RBC passes through the lungs oxygen molecules attach themselves to the hemoglobin. The blood travels around the body and allows the hemoglobin to release the oxygen into cells . once releasing the oxygen the hemoglobin has a large surface area that it needs to fill so it bonds with carbon dioxide and other waste products and transports them back to the lugs so that they can be eliminated from the body. This cycle continues constantly.