NEET BIOLOGY

Detailed explanation-1: -For a healthy resting adult person, the average systolic/ diastolic pressures are 120/180 mm Hg. Aorta is directly supplied by ventricle thus, the blood pressure in the aorta is highest during systole of the ventricle. During it, left ventricle contracts and pushes blood into the aorta.

Detailed explanation-2: -When the heart pushes blood around the body during systole, the pressure placed on the vessels increases. This is called systolic pressure.

Detailed explanation-3: -Answer and Explanation: The correct answer is C: The blood pressure in the aorta is the highest during the second phase of ventricular systole, the ventricular ejection phase. The initial phase of ventricular systole is the isovolumetric contraction.

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: -Systolic pressure is the maximum blood pressure during contraction of the ventricles; diastolic pressure is the minimum pressure recorded just prior to the next contraction. The blood pressure is usually written as the systolic pressure over the diastolic pressure (e.g., 120/80 mm Hg).