1 Heart is called the engine of the human body because it pumps blood.

2 The liver breaks down toxins, drugs, and alcohol using special enzymes. It filters the blood and turns harmful stuff into safer waste the body can get rid of.

3 The kidneys filter your blood to remove waste, balance water levels, and control salt and minerals. They also help regulate blood pressure and make hormones.

4 The small Intestine Absorbs nutrients.  Tiny finger-like parts called villi and microvilli increase surface area so nutrients can pass into the blood easily.

5 We only need one brain because it controls everything centrally. But we have two lungs and kidneys as backups—to protect breathing and filtering if one side gets damaged.

6 Without insulin from the pancreas, sugar builds up in the blood. Cells can’t absorb it for energy, which can lead to high blood sugar, fatigue, and eventually diabetes complications.

7 Organs “talk” using hormones and nerves. For example, the brain signals hunger, the stomach digests, the pancreas releases insulin, and the liver stores sugar—it's a team effort.