Systolic pressure is defined as:

Systolic pressure is defined as:

• A. The peak pressure reached during the cardiac cycle
• B. The lowest pressure during the cycle
• C. The mean pressure across the cycle
• D. The pressure in the veins during systole

Answer: (A)

Systolic pressure is the peak arterial pressure reached during the part of the cardiac cycle when the ventricles contract and eject blood into the aorta. This moment causes the arteries to stretch as they accommodate the surge of blood, producing the highest pressure in the arterial system. That peak pressure is what we refer to as the systolic pressure. In contrast, the lowest arterial pressure occurs when the heart is relaxed (diastole), which is the diastolic pressure. The mean arterial pressure is a separate value that represents an average pressure in the arteries over the entire cycle, not the peak. The veins operate under much lower pressures, and venous pressure during systole is not what systolic pressure measures.

Systolic pressure is the peak arterial pressure reached during the part of the cardiac cycle when the ventricles contract and eject blood into the aorta. This moment causes the arteries to stretch as they accommodate the surge of blood, producing the highest pressure in the arterial system. That peak pressure is what we refer to as the systolic pressure.

In contrast, the lowest arterial pressure occurs when the heart is relaxed (diastole), which is the diastolic pressure. The mean arterial pressure is a separate value that represents an average pressure in the arteries over the entire cycle, not the peak. The veins operate under much lower pressures, and venous pressure during systole is not what systolic pressure measures.