This chapter of the book discusses a lot about the circulatory system, including its functions. These functions include the distribution of nutrients, respiratory gases, metabolic wastes, and hormones all over our bodies. It is also said in the book that there’s this so-called open circulatory system. This system has a character for being slow, with reduced pressure and minimal control over fluid flow. It has also been recently acknowledged as “complex, highly efficient, and strictly controlled enables efficient of a level of tissue perfusion that approaches that of vertebrate closed systems.” To learn more about this topic, kindly click the link below.

https://www.sciencedirect.com/science/article/pii/B9780122475702500396