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How the Heart Works - What the Heart Looks Like - NHLBI, NIH
Anatomy of the interior of the heart. This image shows the four chambers of the heart and the direction that blood flows through the heart. Oxygen-poor blood, shown in blue-purple, flows into the heart and is pumped out to the lungs. Then oxygen-rich blood, shown in red, is pumped out to the rest of the body, with the help of the heart valves.
Heart disease - Symptoms and causes - Mayo Clinic
Heart failure. This is one of the most common complications of heart disease. The heart can't pump enough blood to meet the body's needs. Heart attack. A heart attack can happen if a piece of plaque in an artery or a blood clot moves to the heart. Stroke. The risk factors that lead to heart disease also can lead to an ischemic stroke.
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. The pulmonary artery then carries the oxygen-poor blood from your heart to the lungs.
How the Heart Works - How the Heart Beats - NHLBI, NIH
At rest, a heart rate of 60 to 100 beats per minute is normal. When you exercise, your heart beats faster, and your heart rate speeds up to get more oxygen to your muscles. Signals from your body’s nervous system and hormones from your endocrine system control how fast and hard your heart beats. These signals and hormones allow you to adapt ...
Heart Failure - What Is Heart Failure? - NHLBI, NIH
Heart failure, also known as congestive heart failure, is a condition that develops when your heart doesn’t pump enough blood for your body’s needs. This can happen if your heart can’t fill up with enough blood. It can also happen when your heart is too weak to pump properly. The term "heart failure" does not mean that your heart has stopped.
How the Heart Works - NHLBI, NIH
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 work properly.
Heart disease - Diagnosis and treatment - Mayo Clinic
Heart CT scan, also called cardiac CT scan. In a cardiac CT scan, you lie on a table inside a doughnut-shaped machine. An X-ray tube inside the machine rotates around your body and collects images of your heart and chest. Heart magnetic resonance imaging (MRI) scan.
Coronary Heart Disease - Risk Factors | NHLBI, NIH
Coronary heart disease is the leading cause of death for both men and women in the United States. Men’s risk for coronary heart disease starts to increase significantly around age 45. Before menopause, women have a lower risk of coronary heart disease than men. Around age 55, the risk for women increases more rapidly.
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 fluttering, pounding or racing heartbeat.
Cardiomyopathy - Symptoms and causes - Mayo Clinic
Heart failure. The heart can't pump enough blood to meet the body's needs. Without treatment, heart failure can be life-threatening. Blood clots. Because the heart can't pump well, blood clots might form in the heart. If clots enter the bloodstream, they can block the blood flow to other organs, including the heart and brain. Heart valve problems.
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