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Heart Disease

Understanding Heart Disease

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Understanding Heart Disease

Heart Health Quiz
Take the Heart Health Test How healthy is your heart? Find out more by taking this quiz, based on information from the National Heart, Lung, and Blood Institute (NHLBI) and the American Heart Association (AHA). 1. We've made only modest progress in reducing the toll of heart disease in the last 10 years. You didn't answer this question. You answered The correct answer is Heart attack deaths fell by one-third between 2000 and 2010. A. True B. False 2. Heart disease kills more women than all types of canc...
Fast Facts
Plaque is the culprit in cardiovascular disease. Made up of fat, cholesterol, and other substances, plaque builds up in the arteries, making them narrower and restricting blood flow.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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Anatomy and Function of the Coronary Arteries
Anatomy and Function of the Coronary Arteries Click image to enlarge Coronary arteries supply blood to the heart muscle. Like all other tissues in the body, the heart muscle needs oxygen-rich blood to function. Also, oxygen-depleted blood must be carried away. The coronary arteries wrap around the outside of the heart. Small branches dive into the heart muscle to bring it blood. What are the different coronary arteries? The 2 main coronary arteries are the left main and right coronary arteries. Left mai...
Anatomy and Function of the Heart's Electrical System
Anatomy and Function of the Heart's Electrical System Click image to enlarge The heart's electrical system In the simplest terms, the heart is a pump made up of muscle tissue. Like all muscle, the heart needs a source of energy and oxygen to function. The heart's pumping action is regulated by an electrical conduction system that coordinates the contraction of the various chambers of the heart. How does the heart beat? An electrical stimulus is generated by the sinus node (also called the sinoatrial nod...
Basic Anatomy of the Heart
Basic Anatomy of the Heart Click image to enlarge About the heart The heart is the hardest working muscle in the human body. Located almost in the center of the chest, the adult human heart is about the size of a fist. At an average rate of 80 times a minute, the heart beats about 115,000 times in one day, or about 42 million times in a year. In a 70-year lifetime, an average human heart will beat more than 2.5 billion times. Even when a person is at rest, the heart continuously works hard. The average ...
Anatomy and Function of the Heart Valves
Anatomy and Function of the Heart Valves What are heart valves? The heart consists of 4 chambers, 2 atria (upper chambers) and 2 ventricles (lower chambers). Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood. Valves are actually flaps (leaflets) that act as one-way inlets for blood coming into a ventricle and one-way outlets for blood leaving a ventricle. Normal valves have 3 flaps (leaflets), except the mitral valve, which only has 2 fl...
Cardiovascular Disease Statistics
Cardiovascular Disease Statistics Each year, heart disease is at the top of the list of the country's most serious health problems. In fact, statistics show that cardiovascular disease is America's leading health problem, and the leading cause of death. Consider the most recent statistics released by the American Heart Association: Approximately 84 million people in this country suffer from some form of cardiovascular disease, causing about 2,200 deaths a day, averaging one death every 40 seconds. Almos...
Anatomy and Function of the Heart Valves
Anatomy and Function of the Heart Valves Click Image to Enlarge What are heart valves? The heart consists of four chambers, two atria (upper chambers) and two ventricles (lower chambers). There is a valve through which blood passes before leaving each chamber of the heart. The valves prevent the backward flow of blood. These valves are actual flaps that are located on each end of the two ventricles (lower chambers of the heart). They act as one-way inlets of blood on one side of a ventricle and one-way ...