Human evolution is often told as a tidy story of adaptation, yet some of our most familiar body parts still defy ...

The human body is a wonderous thing, especially when you consider how intricate and efficient each bodily system is. For instance, an adult’s blood vessels could encircle the earth 2.5 times if ...

An introduction to the amazing functions of the human body's nervous system. An introduction to the amazing functions of the human body's nervous system. This extremely advanced part of our biology is ...

A computer-generated image of red blood cells. Nitric oxide—known by the formula NO—is so vital for humans’ internal physiological processes that it was crowned Molecule of the Year in 1992. It plays ...

Humans are complex organisms made up of trillions of cells, each with their own structure and function. Scientists have come a long way in estimating the number of cells in the average human body.

It depends if you count teeth as a group or separately. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Organs are collections of tissues that ...

Humans are among the most capable long-distance runners in the animal kingdom. However, body shape and composition vary ...

A new study reversed transplant rejection twice, uncovering the reasons for transplant rejection on a cellular level ...