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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
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 the Heart Works - 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
Heart disease - Symptoms and causes - Mayo Clinic Symptoms Heart disease symptoms depend on the type of heart disease 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
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 attack - Symptoms causes - Mayo Clinic A heart attack occurs when an artery that sends blood and oxygen to the heart is blocked Fatty, cholesterol-containing deposits build up over time, forming plaques in the heart's arteries If a plaque ruptures, a blood clot can form The clot can block arteries, causing a heart attack During a heart attack, a lack of blood flow causes the tissue in the heart muscle to die
Heart Attack - What Is a Heart Attack? | NHLBI, NIH A heart attack is a life-threatening medical emergency that requires immediate treatment Learn about prevention, symptoms, causes, and treatments for heart attacks
Heart and Vascular Diseases - NHLBI, NIH Heart and vascular, or cardiovascular, diseases include conditions such as arrhythmias, coronary heart disease, heart attack, high blood pressure, congenital heart defects, vascular dementia, and stroke The National Heart, Lung, and Blood Institute (NHLBI) supports research on the causes, diagnosis, treatment, and prevention of heart and vascular diseases, and the interplay of these diseases
Heart rate: Whats normal? - Mayo Clinic A normal resting heart rate for adults ranges from 60 to 100 beats per minute A heart rate above or below that may signal a health condition