Vibrant, educational illustration of the human body's respiratory, circulatory, and cellular processes, highlighting the flow of oxygen, nutrients, and waste.
A colorful, hand-drawn diagram illustrating the human circulatory and respiratory systems, showing oxygen entering the lungs, carbon dioxide being expelled, blood flow from the lungs to the heart, then to the intestines for nutrient absorption, and finally to a cell where food and oxygen are used, with waste and CO2 returned to the heart and lungs.