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How the Heart Works - What the Heart Looks Like | NHLBI, NIH Your heart is in the center of your chest, near your lungs It has four hollow chambers surrounded by muscle and other heart tissue The chambers are separated by heart valves, which make sure that the blood keeps flowing in the right direction Read more about heart valves and how they help blood flow through the heart Anatomy of the interior of the heart This image shows the four chambers
Heart disease - Symptoms and causes - Mayo Clinic Symptoms of heart disease in the blood vessels Coronary artery disease is a common heart condition that affects the major blood vessels that supply the heart muscle A buildup of fats, cholesterol and other substances in and on the artery walls usually causes coronary artery disease This buildup is called plaque
How the Heart Works - How the Heart Beats | NHLBI, NIH Your heartbeat is the contraction of your heart to pump blood to your lungs and the rest of your body Your heart's electrical system determines how fast your heart beats
How Blood Flows through the Heart - NHLBI, NIH Oxygen-poor blood from the body enters your heart through two large veins called the superior and inferior vena cava The blood enters the heart's right atrium and is pumped to your right ventricle, which in turn pumps the blood to your lungs
How the Heart Works - NHLBI, NIH The heart is an organ about the size of your fist that pumps blood through your body It is made up of multiple layers of tissue Your heart is at the center of your circulatory system This system is a network of blood vessels, such as arteries, veins, and capillaries, that carries blood to and from all areas of your body Your blood carries the oxygen and nutrients that your organs need to
Heart Failure - What Is Heart Failure? | NHLBI, NIH Heart failure is a condition that occurs when your heart can't pump enough blood for your body's needs Learn about the symptoms, causes, risk factors, and treatments for heart failure
Coronary Heart Disease - Risk Factors | NHLBI, NIH Your risk of coronary heart disease increases based on the number of risk factors you have and how serious they are Some risk factors — such as high blood pressure and unhealthy cholesterol levels can be adjusted through heart-healthy lifestyle changes Other risk factors, such as your age, family history, and race and ethnicity, cannot be changed Almost half of adults in the United States
Cardiomyopathy - Symptoms and causes - Mayo Clinic Cardiomyopathy (kahr-dee-o-my-OP-uh-thee) is a disease of the heart muscle It causes the heart to have a harder time pumping blood to the rest of the body, which can lead to symptoms of heart failure
Strategies to prevent heart disease - Mayo Clinic Heart disease is a leading cause of death You can't change some risk factors for it, such as family history, sex at birth or age But you can take plenty of other steps to lower your risk of heart disease
Heart arrhythmia - Symptoms and causes - Mayo Clinic A heart arrhythmia (uh-RITH-me-uh) is an irregular heartbeat A heart arrhythmia occurs when the electrical signals that tell the heart to beat don't work properly The heart may beat too fast or too slow Or the pattern of the heartbeat may be inconsistent A heart arrhythmia may feel like a