How the Heart Works - What the Heart Looks Like - NHLBI, NIH
网页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.
Heart Failure - What Is Heart Failure? - NHLBI, NIH
网页2022年3月24日 · What Is Heart Failure? 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 …
How the Heart Works - How the Heart Beats - NHLBI, NIH
网页2022年3月24日 · With each heartbeat, an electrical signal travels from the top of the heart to the bottom. As the signal travels, it causes the heart to contract and pump blood. The heartbeat process includes the following steps. The signal begins in a group of cells, called pacemaker cells, located in the sinoatrial (SA) node in the right atrium.
How the Heart Works - How Blood Flows through the Heart
网页2022年3月24日 · Adding oxygen to blood. 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 …
How the Heart Works - The Heart - NHLBI, NIH
网页2022年3月24日 · The Heart. 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.
What Is Coronary Heart Disease? - NHLBI, NIH
网页2023年12月20日 · Heart disease is the leading cause of death in the United States. Coronary heart disease is a type of heart disease where the arteries of the heart cannot deliver enough oxygen-rich blood to the heart. It is also sometimes called coronary artery disease or ischemic heart disease. About 20.5 million U.S. adults have coronary artery …
Heart-Healthy Living - What Is Heart-Healthy Living? - NHLBI, NIH
网页2024年4月23日 · Heart disease is a leading cause of death in the United States for both men and women. But you can do a lot to protect your heart and stay healthy. Heart-healthy living involves understanding your risk , making healthy choices, and taking steps to reduce your chances of getting heart disease, including coronary heart disease , the most common type.
Heart and Vascular Diseases - NHLBI, NIH
网页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 ...
Take Action for Your Heart: Get Started! Fact Sheet
网页This fact sheet provides heart-healthy tips to help you take action to reduce the risk of heart disease and its risk factors. Print Length: 2 pages. Publication Date: January 2024. Language: English. Related Health Topics: Blood Cholesterol.
How Smoking Affects the Heart and Blood Vessels - NHLBI, NIH
网页2022年3月24日 · The chemicals you inhale when you smoke cause damage to your heart and blood vessels that makes you more likely to develop atherosclerosis, or plaque buildup in the arteries. Any amount of smoking, even occasional smoking, can cause this damage to the heart and blood vessels. Smoking poses an even greater risk for some people, …