Learn all about the human body's many systems and some of its individual organs, both vital and vestigial. When you purchase through links on our site, we may earn an affiliate commission.

The five vital organs in the human body are the brain, heart, lungs, kidneys, and liver. Other organs include the gallbladder, pancreas, and stomach. Organ systems, such as the nervous system ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. The circulatory system consists of three independent systems that work together: the heart ...

Total cell mass does not equal total body mass, because bodies also include large volumes of water. (Calculated for a 60-kilogram female form.) Different systems in the human body account for ...

The human skeletal system consists of all of the bones, cartilage, tendons, and ligaments in the body. Altogether, the skeleton makes up about 20 percent of a person’s body weight. An adult’s ...