The most important thing about the Pixel, for Google and Android and probably you as well, is that this is the first phone to have the Google Assistant built in. Google Now is dead, long live the Google Assistant. Itâs a core piece of the phone, available everywhere just the way Siri is on the iPhone.
1 Understanding the role of each of the four heart valves can help you learn why you might need to be on the look out for certain signs and symptoms. 2  Additional valve terms and related conditions can help you broaden your understanding, too.
Updated August 29, 2016. There are four heart valves in a healthy human heart. The valves help to maintain proper blood flow through the heart, keeping blood moving efficiently and smoothly, and in the right direction. In addition to the valves there are four heart chambers -- the upper chambers are called the left and right atrium, the lower chambers are the left and right ventricle. A healthy heart valve will stop blood from flowing out of a heart chamber until it is time for the heart to pump the blood to its next destination.