Educational audiobook for children to learn how the human body is organized. The vital functions of a living being are nutrition, interaction and reproduction. Tissues are made up of the same types of cells that do the same function. There are four tissue types in our body: connective tissue, epithelial tissue, muscle tissue and nervous tissue. The organs are made up of tissues that work together to perform the same function. Their main function ranges from locomotion to a heart beat. The organism is made up of apparatuses and organ systems. Organ systems are made up of organs that work in a coordinated manner to perform a function. The apparatuses are made up of different organs and organ systems that carry out a function together.