We have white blood cells, also known as leukocytes, and we have our thrombocytes, also known as platelets. And all these three different types of cells arise from the same exact stem cell found in the bone marrow of our bone, known as the hematopoietic stem cell. So let's briefly discuss the function of each one of these cells and let's begin with the red blood cell, also known as erythrocyte. Now, recall that oxygen exists in its diatomic form. So in one oxygen molecule, we have two individual oxygen atoms that are double bonded by nonpolar bond. And that means oxygen is nonpolar.