The human body contains approximately 37.2 trillion cells working in concert. From the 206 bones of an adult skeleton to the 86 billion neurons firing in your brain, every system is a marvel of biological engineering. This quiz challenges you to go beyond the basics and explore the deepest facts about anatomy, physiology, and the extraordinary capabilities of the human body.
The femur (thigh bone) is the strongest bone in the human body. It can support up to 30 times a person's body weight and is also the longest bone, making up roughly a quarter of your total height.
The human body contains approximately 37.2 trillion cells. These include over 200 different cell types, each specialized for different functions — from red blood cells carrying oxygen to neurons transmitting electrical signals at up to 120 meters per second.
The liver is the only internal organ that can regenerate itself. It can regrow to its full size from as little as 25% of its original tissue. The liver performs over 500 functions and weighs approximately 1.5 kilograms in an adult.