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Diastole is the period of time when the heart fills with blood after systole
Systole (medicine)

Systole is the contraction of heart chambers, driving blood out of the chambers. The chamber most often discussed is the left Ventricle . However, all four chambers of the heart undergo systole and diastole in a timed fashion so that blood is propelled forward through the cardiovascular system....
 (contraction). Ventricular
Ventricle (heart)

In the heart, a ventricle is a heart chamber which collects blood from an atrium and pumps it out of the heart.In a four-chambered heart, such as that in humans, there are two ventricles: the right ventricle pumps blood into the pulmonary circulation for the lungs, and the left ventricle pumps blood into the systemic cir...
 diastole is the period during which the ventricles are relaxing, while atrial
Atrium (anatomy)

In anatomy, the atrium , sometimes called auricle, refers to a chamber or space. It may be the atrium of the lateral ventricle in the brain or the blood collection chamber of a heart....
 diastole is the period during which the atria are relaxing.






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Heart Diastole
Diastole is the period of time when the heart fills with blood after systole
Systole (medicine)

Systole is the contraction of heart chambers, driving blood out of the chambers. The chamber most often discussed is the left Ventricle . However, all four chambers of the heart undergo systole and diastole in a timed fashion so that blood is propelled forward through the cardiovascular system....
 (contraction). Ventricular
Ventricle (heart)

In the heart, a ventricle is a heart chamber which collects blood from an atrium and pumps it out of the heart.In a four-chambered heart, such as that in humans, there are two ventricles: the right ventricle pumps blood into the pulmonary circulation for the lungs, and the left ventricle pumps blood into the systemic cir...
 diastole is the period during which the ventricles are relaxing, while atrial
Atrium (anatomy)

In anatomy, the atrium , sometimes called auricle, refers to a chamber or space. It may be the atrium of the lateral ventricle in the brain or the blood collection chamber of a heart....
 diastole is the period during which the atria are relaxing. The term diastole originates from the Greek word d?ast???, meaning dilation.

Inside the heart

During ventricular diastole, the pressure in the (left and right) ventricles drops from the peak that it reaches in systole. When the pressure in the left ventricle drops to below the pressure in the left atrium, the mitral valve
Mitral valve

The mitral valve is a dual-flap heart valve in the heart that lies between the left atrium and the left ventricle . The mitral valve and the tricuspid valve are known collectively as the atrioventricular valves because they lie between the atria and the ventricles of the heart and control the flow of blood....
 (atrioventricular bicuspid valve) opens, causing accumulated blood from the atrium to flow into the ventricle. An easy way to think about this, though untrue, is that Diastole
Diastole

Diastole is the period of time when the heart fills with blood after systole . Ventricle diastole is the period during which the ventricles are relaxing, while atrium diastole is the period during which the atria are relaxing....
 is a sump
Sump

A sump is a low space that collects any often-undesirable liquids such as water or chemicals.An example is the oil pan of an Internal combustion engine....
 that induces suction of blood into the heart to prepare for the next pump
Pump

A pump is a device used to move fluids, such as gases, liquids or Slurry. A pump displaces a volume by physical or mechanical action. One common misconception about pumps is the thought that they create pressure....
 of Systole
Systole

Systole can mean the following:*Systole is a term describing the contraction of the heart.*Systolic geometry is a term used in mathematics....
. The heart is actually filled by the momentum of the blood flowing from the previous systolic cycle, with the "atrial kick
Systole

Systole can mean the following:*Systole is a term describing the contraction of the heart.*Systolic geometry is a term used in mathematics....
" serving as a way to "hoist" the ventricular myocardium over the mass of blood contained within the chamber just prior to systole
Systole

Systole can mean the following:*Systole is a term describing the contraction of the heart.*Systolic geometry is a term used in mathematics....
.

Inside the arteries

The adjective "diastolic" is used to refer to filling of the heart
Heart

The heart is a muscle organ in all vertebrates responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods....
 with blood between muscle contractions. It is used to describe the opposite portion of the cardiac cycle
Cardiac cycle

Cardiac cycle is the term referring to all or any of the events related to the flow of blood that occur from the beginning of one heartbeat to the beginning of the next....
 related to contraction. More typically it is used as one component of measurement of blood pressure
Blood pressure

Blood pressure is the pressure exerted by circulating blood on the walls of blood vessels, and constitutes one of the principal vital signs. The pressure of the circulating blood decreases as it moves away from the heart through artery and capillary, and toward the heart through veins....
. "Diastolic pressure" refers to the lowest pressure within the arterial blood stream occurring during each heart beat. The other component of blood pressure is systolic pressure
Systole (medicine)

Systole is the contraction of heart chambers, driving blood out of the chambers. The chamber most often discussed is the left Ventricle . However, all four chambers of the heart undergo systole and diastole in a timed fashion so that blood is propelled forward through the cardiovascular system....
, which refers to the highest arterial pressure during each heart beat.

When blood pressure is stated for medical purposes, it is usually summarized as a ratio of systolic to diastolic pressure; for example: 120/80 mmHg
Torr

The torr is a non-International System of Units unit of pressure defined as 1/760 of an Atmosphere . It was named after Evangelista Torricelli, an Italian physicist and mathematician who discovered the principle of the barometer in 1644....
.

Time Definition of Diastole

Time variables of diastole may be split left and right. The left heart time variable of diastole is Aortic Valve close to Aortic Valve open. The right heart time variable is Pulmonic Valve close to Pulmonic Valve open. Both are readily adapted to the Wiggers diagram
Wiggers diagram

A Wiggers diagram is a standard diagram used in cardiac physiology.The X axis is used to plot time, while the Y axis contains all of the following on a single grid:...
.

See also

  • Systole (medicine)
    Systole (medicine)

    Systole is the contraction of heart chambers, driving blood out of the chambers. The chamber most often discussed is the left Ventricle . However, all four chambers of the heart undergo systole and diastole in a timed fashion so that blood is propelled forward through the cardiovascular system....
  • Blood pressure
    Blood pressure

    Blood pressure is the pressure exerted by circulating blood on the walls of blood vessels, and constitutes one of the principal vital signs. The pressure of the circulating blood decreases as it moves away from the heart through artery and capillary, and toward the heart through veins....
  • Wiggers diagram
    Wiggers diagram

    A Wiggers diagram is a standard diagram used in cardiac physiology.The X axis is used to plot time, while the Y axis contains all of the following on a single grid:...


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