Educational audiobook for children to learn what the relation between the vital functions and the organ systems of the human body is. Living beings carry out the three vital functions, same as every other living being. These functions are interaction, nutrition and reproduction. But, did you know that to be able to carry them out, organ systems should coordinate and work together? These systems are: the sense organs, the nervous system, the digestive system, the excretory system, the locomotor system, the respiratory system and the reproductive system. This audiobook is an excellent resource for elementary school.