Your Body: The Heart

Have you ever felt your chest thump when you run, play, or get excited? That steady beat is your heart at work, pumping blood to every part of your body. This worksheet helps you explore what the heart looks like, how it works, and why it is one of the most important organs you have. As you complete each activity, you begin to see that the heart never rests—it beats from before you are born until the end of your life.

Your learning begins with the structure of the heart. Activities guide you to discover that the heart is a strong, muscular organ with four chambers: the left atrium, right atrium, left ventricle, and right ventricle. These chambers work like tiny rooms that fill and squeeze blood in a specific pattern. You start to understand that the heart is not just a simple pump—it is a carefully designed machine.

Next, you explore how blood travels through the body. The heart sends oxygen-rich blood from the lungs to the body and returns oxygen-poor blood back to the lungs to get refreshed. Activities help you trace this path, showing how the heart and lungs work as a team to keep you alive. You learn that every heartbeat pushes nutrients and oxygen to your muscles, brain, and organs.