Vein

Vein explained in an easy to understand way:

Imagine trying to return a library book before its due date, ensuring it gets back to its rightful place on the shelf. This act of returning the book is similar to how veins work in the human body. Just as you transport the book back to the library to avoid fines and restore order, veins carry blood back to the heart to ensure the body functions smoothly. In this analogy, the library is the heart, the book is the blood, and the journey taken to return it represents the pathway of the veins.