ANATOMY

Detailed explanation-1: -The higher pressure occurs during the contraction of the heart’s left ventricle. The higher pressure is known as the systolic blood pressure. The lower pressure occurs during the relaxation of the heart’s left ventricle.

Detailed explanation-2: -Blood pressure readings are given in two numbers. The top number is the maximum pressure the heart exerts while beating (systolic pressure). The bottom number is the amount of pressure in the arteries between beats (diastolic pressure).

Detailed explanation-3: -The first number, called systolic blood pressure, measures the pressure in your arteries when your heart beats. The second number, called diastolic blood pressure, measures the pressure in your arteries when your heart rests between beats.

Detailed explanation-4: -During systole, arterial blood pressure reaches its peak (systolic blood pressure), normally about 90 to 120 mm of mercury in humans. In an electrocardiogram (ECG, or EKG), the beginning of ventricular systole is marked by the deflections of the QRS complex.

Detailed explanation-5: -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).