Heart: How the Heart Works Index

Featured: How the Heart Works Main Article

The heart is a very important organ in the body. It is responsible for continuously pumping oxygen and nutrient-rich blood throughout your body to sustain life. It is a fist-sized muscle that beats (expands and contracts) 100,000 times per day, pumping a total of five or six quarts of blood each minute, or about 2,000 gallons per day.

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    Related Diseases & Conditions

    • Blood Clots Blood clots can occur in the venous and arterial vascular system. Blood clots can form in the heart, legs, arteries, veins,...learn more »
    • Low Blood Pressure (Hypotension) Low blood pressure, also referred to as hypotension, is blood pressure that is so low that it causes symptoms or signs due to the...learn more »
    • Congestive Heart Failure (CHF) Congestive heart failure (CHF) refers to a condition in which the heart loses the ability to function properly. Heart disease,...learn more »
      In This Article
      Congestive Heart Failure (CHF) Article
      • Congestive heart failure facts
      • What is congestive heart failure (CHF)?
      • What causes congestive heart failure?
      • What are the signs and symptoms of congestive heart failure?
      • What are the risk factors for congestive heart failure?
      • How is congestive heart failure diagnosed?
      • What is the treatment for congestive heart failure?
      • What lifestyle changes can help treat congestive heart failure?
      • Exercise
      • Diet
      • Fluid regulation
      • Maintaining weight
      • What is the long term prognosis for patients with congestive heart failure?
      • Can congestive heart failure be prevented?
    • High Blood Pressure High blood pressure is defined as a pressure of 140/90 mmHg or higher in the arteries. Genetic factors, high salt intake, and...learn more »
      In This Article
      High Blood Pressure Article
      • What is high blood pressure?
      • What causes high blood pressure?
      • How is blood pressure measured?
      • What do blood pressure readings mean?
      • What are the signs and symptoms of high blood pressure?
      • How is high blood pressure diagnosed?
      • What is the treatment for high blood pressure?
      • What are the potential risks and complications of untreated high blood pressure?
      • What dietary strategies can help lower high blood pressure?
      • How does exercise help lower high blood pressure?
      • Is complementary and alternative medicine effective for treating high blood pressure?
    • Premature Ventricular Contractions (PVCs) Premature ventricular contractions (PVCs) are premature heartbeats originating from the ventricles of the heart. PVCs are...learn more »
      In This Article
      Premature Ventricular Contractions (PVCs) Article
      • What are premature ventricular contractions (PVCs)?
      • What happens during a premature ventricular contraction?
      • How common are premature ventricular contractions?
      • What causes premature ventricular contractions?
      • What are premature ventricular contraction symptoms?
      • What are the dangers of premature ventricular contractions?
      • How is premature ventricular contraction diagnosed?
      • What are the treatments for premature ventricular contractions?
    • Heart Murmur A heart murmur is the sound generated when blood flow within the heart is not smooth. Causes of heart murmurs can be functional,...learn more »
      In This Article
      Heart Murmur Article
      • Heart murmur facts
      • What is a heart murmur?
      • What causes a heart murmur?
      • What are the risk factors for heart murmur?
      • What are the symptoms of a heart murmur?
      • When should I seek medical care for a heart murmur?
      • How is a heart murmur diagnosed?
      • What is the treatment for a heart murmur?
      • What are the complications of a heart murmur?
      • Can heart murmur be prevented?
      • What is the outlook (prognosis) for a patient with a heart murmur?

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