Physiology is taught (at least in medical faculties) not in the 1st year. This means that you need to learn something else on histology, the same anatomy, in order to come to the basics of physiology and be able to correctly interpret concepts. And from a practical point of view, pathophysiology is more useful, which is studied even later - after biochemistry. Here they correctly write that physiology and pathophysiology answer your question best of all, but if you just read it like a book, then you can really confuse and harm yourself / someone. There is a huge difference between self-study medicine and college education. This is one of the main reasons why there is no correspondence department in medical faculties.
Read the book "Anatomy in 30 Seconds". The book is very easy to write, you will understand everything and can tell others. In general, this is a series of books, so if you're interested, google it and download the entire collection))) good luck
I agree with the answer above - anatomy is dry for understanding the work of the body. As a physiologist, read physiology. But if you do not have basic knowledge, it will be uninteresting and difficult to read the textbook. There is a good book "Visual physiology" - on one page a function, on another picture, and so the next spread is function + picture. On the Internet there is. If some terms are not clear, there is a good book by Raff Herschel "Secrets of Physiology" (also available for download).
If you want to know how the body works, then you need to read human physiology. Anatomy very poorly answers the questions "why" and "how", and in great detail - to the questions "what?" And "where?" Read "Human Physiology" edited by Pokrovsky. And if you want to know how the body works in conditions of disease, to find out the cause and mechanism of disease development, then read "Human Pathophysiology" edited by Novitsky.