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Systole occurs when the heart contracts to pump blood out, and diastole occurs when the heart relaxes after contraction.
Top number, called systolic pressure. The top number measures the pressure in the arteries when the heart beats. Bottom number, called diastolic pressure. The bottom number measures the pressure in the arteries between heartbeats. The American College of Cardiology and the American Heart Association divide blood pressure into four general ...
Use our blood pressure chart to learn what your blood pressure levels and numbers mean, including normal blood pressure and the difference between systolic and diastolic.
Confused by blood pressure numbers? Learn more about normal ranges for systolic and diastolic blood pressure readings in this in depth explanation with chart from WebMD.
Systolic blood pressure is the top number and refers to the amount of pressure experienced by the arteries while the heart is beating. Diastolic blood pressure is the bottom number and refers to the amount of pressure in the arteries while the heart is resting in between heartbeats.
Both the atria and the ventricles undergo alternating states of systole and diastole. In other words, when the atria are in diastole, the ventricles are in systole and vice versa.
The cardiac cycle events can be split into diastole and systole. The diastole indicates ventricular filling, while the systole indicates ventricular ejection or contraction. Though with varying pressures, the systole and diastole occur in both the right and left heart.
Systole refers to the period when your heart contracts and pushes blood out to the rest of your body. Diastole is when the heart relaxes and refills with blood.
Ideal blood pressures should fall within the range of less than 120 mm Hg systolic and less than 80 mm Hg diastolic.
Cardiac cycle events can be divided into diastole and systole. Diastole represents ventricular filling, and systole represents ventricular contraction/ejection. Systole and diastole occur in both the right and left heart, though with very different pressures (see hemodynamics below).