What to know about your liver The liver is the body’s largest solid, internal organ. In the upper right part of your abdomen, the liver is your body's filtration system.

1. Skin (Image credit: Toa55 via Getty Images) Skin wears the crown of the heaviest organ in the human body — however, there's some discrepancy as to how much it actually weighs.

Scientists at Columbia University have created a set of real — and really tiny — human organs that interact on a chip, a “huge achievement” that could help test life-saving drugs.

However, the largest organ in the human body is actually external, it’s the skin. Covering your entire body, the skin serves as a crucial barrier between you and the outside world.

The largest muscle in the human body is the Gluteus Maximus. It is responsible for keeping your posture upright, and is the principal antigravity force working when you walk up stairs.

As for counting organs in the human body, it depends on whom you ask and how you count, Lee said. Although no one knows where the number originates, the general count is 78 organs, she said.