In this image, red is the color of absorption. The red cells in this image are enterocytes, which line the walls of your small intestine and are responsible for absorbing nutrients from the food you ...

You may think of the small intestine as a smooth tube that winds its way through your abdomen. But if you were to look really closely at the inside of the intestine, you would see that it is lined ...

Tourists visiting an unfamiliar city would have a hard time finding their way around if they were using nothing but a topological map, no matter how detailed. Most tourist maps, therefore, highlight ...