Sinoatrial node. The sinoatrial node (SAN; also known as sinus node) is a group of cells located in the wall of the right atrium of the heart.
How Do Web Browsers Work? The World Wide Web is a system of Internet servers that support specially formatted documents. Web browsers are used to make it easy to access the World Wide Web. Browsers are able to display Web pages largely in part to an underlying Web protocol called HyperText Transfer Protocol (HTTP).
If you've ever seen an https or http in the URL address of a website, you might have wondered what it stands for. These are technology protocols that make it possible for Web users to view links, jump from link to link, from page to page, from website to website. Without these technology protocols, the Web would look very different; in fact, we might not even have the Web as we know it today. Here's more in-depth information about both of these Web protocols. HTTP: Hyper Text Transfer Protocol