MICROANATOMY

Detailed explanation-1: -Diastole begins with the closing of the aortic valve (or pulmonic) and ends with the closing of the mitral valve (or tricuspid). This period encompasses the ventricular relaxation and filling. Diastole represents when the blood vessels return blood to the heart in preparation for the next ventricular contraction.

Detailed explanation-2: -Ventricular diastole: lasts about 0.5 seconds-begins before atrial systole, allowing the ventricles to fill passively with blood from the atria.

Detailed explanation-3: -The ventricular “Diastole", or relaxation, begins with “Isovolumic relaxation", then proceeds through three sub-stages of inflow, namely: “Rapid inflow", “Diastasis", and “Atrial systole".

Detailed explanation-4: -The period of relaxation is called diastole in which the ventricle fills with blood and the period of ventricle contraction is called systole.

Detailed explanation-5: -The longest phase of the heart cycle is atrial diastole. This phase lasts for 0.7 seconds.