Human Circulatory System Model, Ideal for Lab And Education. It is like a real circulatory System Scientific model on Board. The human circulatory system is a complex network that transports blood, nutrients, gases (like oxygen and carbon dioxide), hormones, and other essential substances throughout the body. The circulatory system consists of the heart, blood vessels, and blood. It is crucial in maintaining homeostasis and supporting the body’s overall health. Labzo is the largest store of scientific models in Bangladesh. We have online and offline outlets to properly supply the models.