'Cardiac' is a Greek word to mean 'related to the heart'.

Heart is composed of cardiac muscle and connective tissue.

Average human heart beats at 72 beats per minute.

A heart beats approximately 2.5 billion times during an average 66 year lifespan.

A human heart weighs approximately 250 to 300 grams in females and 300 to 350 grams in males.

Valves of the heart were discovered by a physician of the Hippocratean school around the 4th century BC.

Plato theorized that reasoning originated in the brain, but passion originated in the heart.

The human heart has four chambers, two superior atria and two inferior ventricles.

Women hearts beat faster than men.

The first open heart surgery was performed by Dr. Daniel Hall Williams in 1893.

The first successful heart transplant was performed in Cape Town, South Africa in 1967.

Most heart attacks occur between the hours of 8 and 9 AM.

Blood takes about 20 seconds to circulate through the entire human body.

The heart pumps blood to almost all of the body’s 75 trillion cells. Only the corneas receive no blood supply.

Your system of blood vessels -- arteries, veins and capillaries -- is over 60,000 miles long. That's long enough to go around the world more than twice!

The adult heart pumps about 5 quarts of blood each minute - approximately 2,000 gallons of blood each day - throughout the body.

When attempting to locate their heart, most people place their hand on their left chest. Actually, your heart is located in the center of your chest between your lungs. The bottom of the heart is tipped to the left, so you feel more of your heart on your left side of your chest.

The heart beats about 100,000 times each day.

In a 70-year lifetime, the average human heart beats more than 2.5 billion times.

An adult woman's heart weighs about 8 ounces, a man's about 10 ounces.

A child's heart is about the size of a clenched fist; an adult's heart is about the size of two fists.
Blood is about 78 percent water.

Blood takes about 20 seconds to circulate throughout the entire vascular system.

The structure of the heart was first described in 1706, by Raymond de Viessens, a French anatomy professor.

The electrocardiograph (ECG) was invented in 1902 by Dutch physiologist Willem Einthoven. This test is still used to evaluate the heart's rate and rhythm.

The first heart specialists emerged after World War I.

Electrical impulses in the heart muscle (the myocardium) are what cause the heart to beat.

The risk of heart disease for inactive people is double that of people who get regular exercise.

A newborn baby has about one cup of blood in circulation.

Prolonged lack of sleep can cause irregular jumping heartbeats called premature ventricular contractions (PVCs).

Heartbeats with enough strength to shoot blood a distance of 30 feet.

The Electrocardiogram (ECG) is used to test heart rate was developed in 1902.

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