Health and the human body, explained visually

Your body runs thousands of processes every second without asking for your attention: the heart pumping about five litres of blood a minute, the kidneys filtering it, the immune system checking every cell it meets, hormones rising and falling through the day. Understanding how these systems work makes health advice make sense — why sleep matters, why blood pressure is measured, why antibiotics don't work on a cold. Know.it's health lessons animate the body from the inside so you can see it happen.

Browse free explainers on the major organ systems (heart and circulation, lungs, digestion, kidneys, brain and nerves), the immune system and vaccines, hormones and sleep, nutrition — calories, vitamins, cholesterol — and how medical tools like MRI scans, X-rays and anaesthesia work. Every card opens a short written explanation. Visual lessons can be requested using available credits or plan allowance.

These lessons are for understanding and general education only; they are not medical advice, so always talk to a doctor about your own health. Ask any health question and learn in English, Hindi, Marathi, Tamil, Telugu, Hinglish and Minglish, depending on your plan and selected lesson options.