Understanding Your Heart
There are 4 large components of the heart: 1. The heart muscle 2. The valves of the heart, 3. The blood supply to the heart, 4. The electrical system of the heart. If any of these four components go wrong it can affect how your heart functions.
The HeartThe hollow center of your heart is divided into four sections, called chambers. Each chamber is like a separate room, with doors (valves) that let blood in and out.
Where Blood Flows In — The Atria Apex of the heart
The two upper chambers in your heart are called the atria. The atria are the receiving chambers of your heart. When blood flows into your heart from the body or lungs, it always flows into either the right or left atrium — never anywhere else. (One upper chamber is called an atrium. Both upper chambers together are called the atria.) Blood from the body goes to the right atrium, while the left atrium receives blood from the lungs, through structures called the pulmonary veins.