Final answer:
Hemoglobin is made up of heme and globin, with heme being an iron-containing compound and globin being a protein. The heme binds oxygen, allowing hemoglobin to carry oxygen in red blood cells.
Step-by-step explanation:
Hemoglobin is made up of two main components: heme and globin. Heme is an iron-containing compound that binds to oxygen. It is embedded in the globin protein, which consists of four folded polypeptide chains - two alpha chains and two beta chains. Each chain is made up of a specific sequence of amino acids.