Galen thought the heart was a heater that warmed the blood

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Presentation transcript:

Galen thought the heart was a heater that warmed the blood In the middle ages, scholars felt that the Holy Spirit delivered air through the arteries and veins. William Harvery is credited with modern ideas of circulation.

Measure of Heart Performance EKG Measures the electrical activity of the heart Blood Pressure indicates the strength of heart contraction and the resistance to blood flow

The Electrocardiogram

Blood Pressure Systolic Pressure ( 120 mm Hg) is caused by contraction of the ventricles Diastolic Pressure (80 mm Hg) is the pressure when the heart is completely relaxed Arterial resistance to blood flow may raise blood pressure

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