Some human body parts have become useless over the past few million years. These include wisdom teeth, the tail bone, and the muscle fibers that produce goose bumps. Take a look at nine body parts ...

The five vital organs in the human body are the brain ... an artery that branches to distribute blood to itself and other body parts (except the lungs). The lungs work with the heart to oxygenate ...

The trillions of cells of the human body must be arranged in precise patterns ... In doing so, these methods give researchers a ‘parts list’ of cell types in a tissue of interest.

The female reproductive system is one of the most vital parts of the human reproductive process ... These signs are the body’s reactions to the hormones generated during the fertilization ...