Summary of Heart (anatomy)

00:00:00 - 00:25:00

The heart is a large, muscular organ located in the chest that is responsible for pumping blood throughout the body. It is made up of three layers of tissue, has four valves, and is surrounded by the pericardium. The electrical system of the heart triggers contractions that pump blood through the body. If an artery becomes blocked, it can cause pulmonary embolism, which can be fatal.

• 00:00:00 In this video, the author discusses the heart and its various chambers. He also discusses the blood vessels that carry blood to and from the heart. He also discusses the position of the heart in the body and how it does not rotate.
• 00:05:00 The heart consists of three layers of tissue: an endocardium, myocardium, and pericardium. The myocardium is made up of cardiac muscle cells that are connected to one another, and an electrical impulse can be transferred across the muscle wall. The heart is surrounded by pericardium, which is the same thing as the epicardium.
• 00:10:00 The heart has four valves that allow blood to flow in and out of the heart. The left atrium receives blood from the left ventricle and the left atrial ventricular valve sends blood to the left ventricle. The left atrial ventricular valve also has two leaflets that open and close to allow blood to flow. The left atrial ventricular valve is connected to the left ventricle by the left atrial muscular wall. The left ventricle has a thicker muscular wall than the right ventricle because it pumps blood out through the aorta.
• 00:15:00 The heart has a fibrous skeleton that supports valves, and an electrical system that triggers contractions.
• 00:20:00 The video discusses the anatomy of the heart, focusing on the atria and the AV node. When the electrical activity gets to the AV node, it won't pass straight from the atria to the ventricles; it will first pass through the AV node and then the bundle of his-then called the atrioventricular bundle-splits into two, descends down the muscular part of the interventricular septum, and connects to the subendocardial fibers. The atria contract and push the blood into the ventricles, which twist and contract to push the blood up through the mitral valve and into the left ventricle. When the atria relax, the ventricles contract and push the blood back through the aorta and into the left ventricle. If a pulmonary embolism occurs, it can affect the heart by causing a leaky valve, regurgitation, or stenosis.
• 00:25:00 The heart is a large organ located in the chest. It is responsible for pumping blood throughout the body. When an artery is blocked, it can cause pain, shortness of breath, and other symptoms. Pulmonary embolism is a common complication of heart disease, and can be fatal.