Have 更多 文章 like this one on November24.info
Blood, Lymph, Hormons and Secretions in general, must, to answer their purpose reach the place in the Body where they are useful.
The Transportation they can use to be there is Circulation, and Circulation only, Blood Circulation 或者 Lymph Circulation.
Secretions serve all bodily Functions, to have them existing, started, regulated, stopped and so on...
And without unity of Secreted Substances and Body receptors for them, in just one place, to come together, there is no biochemical reaction between them, and therefore no Biochemistry, no Physiology,...