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 ...

There are arguably some parts of the human body that don't serve any useful purpose, such as the male nipple. That said, the usefulness of some organs is still up for debate, as scientists have ...

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 ...