The Oval Office exerts tremendous gravitational pull on its occupants. President Obama, in a fingers-crossed wish, has already predicted that the tug of the office eventually will move Trump into a more conventional orbit. Not so far.
Red blood cells are also known as erythrocytes. The red blood cells transport oxygen through the circulatory system to the cells and tissues of the body. In the cells, oxygen and glucose support glycolysis, the production of ATP (adenosine triphosphate). The red blood cells are filled with hemoglobin, the oxygen-carrying part of the red blood cell. Hemoglobin can also be spelled âhaemoglobin.â Each red blood cell contains 250 to 300 million molecules of hemoglobin. A molecule of hemoglobin is made up of one globin protein, with four iron-containing heme groups.
The hemoglobin is the part of the erythrocyte that actually carries the oxygen and carbon dioxide. Red blood cells are made in the red marrow of bones, and live about 120 days. Because they wear out so quickly, an entire supply of red blood cells is renewed every four months. As red blood cells wear out in the bloodstream, they are taken in by the spleen, an organ on the left side of the abdomen below the stomach, and destroyed. Parts of the old cells are salvaged to make new red blood cells. The picture below shows what a blood smear looks like under a microscope.