Читать книгу The Power Of Youth. How To Tune Our Mind And Body For A Long And Healthy Life - Андрей Фоменко - Страница 24

Cells composed of atoms form tissues: epithelial, connective, muscular, and nervous. And tissues form organs. The latter, in turn, are combined into systems.

All systems interact closely with each other. For example, the digestive system provides the intake of nutrients in the blood for energy. However, the cells can produce energy only with oxygen, which is supplied by the respiratory system.