diastole$21064$ - ορισμός. Τι είναι το diastole$21064$
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Τι (ποιος) είναι diastole$21064$ - ορισμός

PART OF THE CARDIAC CYCLE WHEN A HEART CHAMBER CONTRACTS
Systolic; Systole and Diastole; Systole (medicine); Sistolic; Hemisystole
  • A [[Wiggers diagram]], showing various events during systole (here primarily displayed as ''ventricular systole'', or ''ventricular contraction''). The very short interval (about 0.03 second) of isovolumetric, or fixed-volume, contraction begins (see upper left) at the R peak of the QRS complex on the electrocardiogram graph-line. + Ejection phase begins immediately after isovolumetric contraction—ventricular volume (red graph-line) begins to decrease as ventricular pressure (light blue graph-line) continues to increase; then pressure drops as it enters diastole.

Diastole         
PART OF THE CARDIAC CYCLE WHEN THE HEART REFILLS WITH BLOOD FOLLOWING SYSTOLE (CONTRACTION)
Diastolic; Filling veolcity; Diastolic filling velocity; Ventricular filling; Ventricular filling velocity; Distole; Diastolic phase; Ventricular relaxation period
·noun A figure by which a syllable naturally short is made long.
II. Diastole ·noun The rhythmical expansion or dilatation of the heart and arteries;
- correlative to systole, or contraction.
diastole         
PART OF THE CARDIAC CYCLE WHEN THE HEART REFILLS WITH BLOOD FOLLOWING SYSTOLE (CONTRACTION)
Diastolic; Filling veolcity; Diastolic filling velocity; Ventricular filling; Ventricular filling velocity; Distole; Diastolic phase; Ventricular relaxation period
[d??'ast?li]
¦ noun Physiology the phase of the heartbeat when the heart muscle relaxes and allows the chambers to fill with blood. Often contrasted with systole.
Derivatives
diastolic adjective
Origin
C16: via late L. from Gk, 'separation, expansion'.
diastole         
PART OF THE CARDIAC CYCLE WHEN THE HEART REFILLS WITH BLOOD FOLLOWING SYSTOLE (CONTRACTION)
Diastolic; Filling veolcity; Diastolic filling velocity; Ventricular filling; Ventricular filling velocity; Distole; Diastolic phase; Ventricular relaxation period
n.
Dilatation, outward throb.

Βικιπαίδεια

Systole

Systole ( SIST-ə-lee) is the part of the cardiac cycle during which some chambers of the heart contract after refilling with blood. The term originates, via New Latin, from Ancient Greek συστολή (sustolē), from συστέλλειν (sustéllein 'to contract'; from σύν sun 'together' + στέλλειν stéllein 'to send'), and is similar to the use of the English term to squeeze.

The mammalian heart has four chambers: the left atrium above the left ventricle (lighter pink, see graphic), which two are connected through the mitral (or bicuspid) valve; and the right atrium above the right ventricle (lighter blue), connected through the tricuspid valve. The atria are the receiving blood chambers for the circulation of blood and the ventricles are the discharging chambers.

In late ventricular diastole, the atrial chambers contract and send blood to the ventricles. This flow fills the ventricles with blood, and the resulting pressure closes the valves to the atria. The ventricles now perform isovolumetric contraction, which is contraction while all valves are closed. This contraction ends the first stage of systole. The second stage proceeds immediately, pumping oxygenated blood from the left ventricle through the aortic valve and aorta to all body systems, and simultaneously pumping oxygen-poor blood from the right ventricle through the pulmonic valve and pulmonary artery to the lungs. Thus, the pairs of chambers (upper atria and lower ventricles) contract in alternating sequence to each other. First, atrial contraction feeds blood into the ventricles, then ventricular contraction pumps blood out of the heart to the body systems, including the lungs for resupply of oxygen.

Cardiac systole is the contraction of the cardiac muscle in response to an electrochemical stimulus to the heart's cells (cardiomyocytes).

Cardiac output is the volume of blood pumped by the ventricles in one minute. The ejection fraction is the volume of blood pumped divided by the total volume of blood in the left ventricle.