Gaseous exchange models
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Constructing a lung model is an excellent way to learn about the respiratory system and how the lungs function. ... Gas exchange occurs at lung alveoli (tiny air sacs), as carbon dioxide is exchanged for oxygen. This oxygen is then delivered to the tissues and cells of the body by the circulatory system.

Explanation:

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for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .