How Much Do You Know About Your Organs?

Your body operates like a well-oiled machine, with your organs being the key moving parts. There are five essential organs that are crucial for survival: the brain, heart, kidneys, liver, and lungs. But in total, your body has 78 organs that contribute to its smooth functioning, including the skin, spleen, gallbladder, pancreas, and more. Each organ plays a unique role in helping you stay active, communicate, and even update your social media. While some organs may not be as vital today (thanks to evolution), others are absolutely critical for keeping you alive. Think you know the function of each organ and its role in your body?

We’ve put together a quiz with 40 questions about your body’s organs, their functions, and their importance. If you’re familiar with the basics, you might think you know your organs inside and out—but even the experts struggle to get more than 30 questions right. Do you think you can do better? Take on this challenging organ quiz and find out!