2022年3月24日 · The heart is made of three layers of tissue. Endocardium is the thin inner lining of the heart chambers and also forms the surface of the valves. Myocardium is the thick middle layer of muscle that allows your heart chambers to contract and relax to pump blood to your body. Pericardium is the sac that surrounds your heart. Made of thin layers ...

2022年3月24日 · Blood also carries carbon dioxide to your lungs so you can breathe it out. Inside your heart, valves keep blood flowing in the right direction. Your heart’s electrical system controls the rate and rhythm of your heartbeat. A healthy heart supplies your body with the right amount of blood at the rate needed to work well.

2024年12月6日 · Cardiomyopathy is a disease that weakens the heart muscle. This makes it harder for your heart to pump blood. The word "cardiomyopathy" means "heart muscle disease." Learn more about how the heart works. Cardiomyopathy can affect people of any sex, race, or age. There are several types of cardiomyopathy and many causes and risk factors.

2022年3月24日 · Some conditions can affect normal blood flow through these heart arteries. Examples include: Angina; Heart attack; Coronary heart disease; The coronary veins return oxygen-low blood from the heart's muscles back to the right atrium so it can be pumped to the lungs. They include: The anterior cardiac veins; The great cardiac vein; The middle ...

2022年3月24日 · Most people survive heart attacks and live active, full lives. If you get help quickly, your treatment can limit damage to your heart muscle. Less heart damage and healthy lifestyle changes improve your chances of a better quality of life after a heart attack.

2023年10月10日 · Myocarditis is inflammation of the myocardium — the heart muscle. This inflammation can also cause other changes to the heart muscle cells that may be acute or chronic . Acute myocarditis is typically caused by an infection, like a virus. Chronic myocarditis is typically caused by another medical condition, like an autoimmune disorder ...

2023年10月10日 · These may include SARS-CoV-2 (the virus that causes COVID-19), adenovirus, coxsackievirus (including hand, foot, and mouth disease), herpes virus, influenza (flu) virus, and parvovirus B19 (which causes an infection common in children known as fifth disease). Viruses may infect the heart muscle tissue, causing the body’s immune system to react.

2023年10月10日 · Cardiac troponins or creatine kinase-MB are blood markers that increase when there is damage to your heart. Since there are no specific blood tests for myocarditis, these markers can be a sign of injury to the heart muscle. However, they also increase with heart attack or other injury and do not necessarily mean you have myocarditis.

2022年3月24日 · 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 hormone from your endocrine system control how fast and hard your heart beats. These signals and hormones allow you to adapt to ...

2022年3月24日 · Physical activity is one part of a heart-healthy lifestyle. A heart-healthy lifestyle also involves following a heart-healthy eating, aiming for a healthy weight, managing stress, and quitting smoking. Being physically active is one of the best ways to keep your heart and lungs healthy. Many Americans are not active enough.