Hemoglobin in blood conveys oxygen from the lungs or gills to the remainder of the body (for example the tissues). There it discharges the oxygen to allow vigorous breath to give vitality to control the elements of the creature in the process called digestion. A solid individual has 12 to 20 grams of hemoglobin in each 100 ml of blood. In well evolved creatures, the protein makes up about 96% of the red platelets' dry substance (by weight), and around 35% of the all out substance (counting water). Hemoglobin has an oxygen-restricting limit of 1.34 mL O2 per gram, which expands the all out blood oxygen limit seventy-overlap contrasted with broke down oxygen in blood. The mammalian hemoglobin particle can tie (convey) up to four oxygen molecules. Hemoglobin is associated with the vehicle of different gases: It conveys a portion of the body's respiratory carbon dioxide (around 20–25% of the total as carbaminohemoglobin, in which CO2 is bound to the heme protein. The atom likewise conveys the significant administrative particle nitric oxide bound to a globin protein thiol gathering, discharging it simultaneously as oxygen. Hemoglobin is likewise found outside red platelets and their ancestor lines. Different cells that contain hemoglobin incorporate the A9 dopaminergic neurons in the substantia nigra, macrophages, alveolar cells, lungs, retinal shade epithelium, hepatocytes, mesangial cells in the kidney, endometrial cells, cervical cells and vaginal epithelial cells. In these tissues, hemoglobin has a non-oxygen-conveying capacity as a cancer prevention agent and a controller of iron metabolism.