**Question:** If a person has an arterial blood pressure of 125/75 mm Hg:

**Core Concept:** Blood pressure is a measure of force exerted by circulating blood on the walls of blood vessels, and is essential for maintaining perfusion of vital organs. Systolic pressure (SBP) represents the peak pressure during the cardiac cycle, while diastolic pressure (DBP) represents the minimal pressure required to keep blood flowing to tissues. A normal blood pressure is considered within a range of 90-120 mm Hg for SBP and 60-80 mm Hg for DBP.

**Why the Correct Answer is Right:** A blood pressure reading of 125/75 mm Hg can be interpreted as a Stage 1 hypertension for systolic pressure (SBP) and normal diastolic pressure (DBP). Stage 1 hypertension is defined as a SBP between 130-139 mm Hg or a DBP between 80-89 mm Hg.

**Why Each Wrong Option is Incorrect:**

A. **Incorrect blood pressure value:** Option A presents a blood pressure of 125/90 mm Hg, which is higher than the Stage 1 hypertension range.

B. **Incorrect blood pressure value:** Option B presents a blood pressure of 125/60 mm Hg, which is lower than the normal range for both SBP and DBP.

C. **Incorrect blood pressure value:** Option C presents a blood pressure of 125/70 mm Hg, which is higher than the normal range for SBP but still within the normal range for DBP.

D. **Incorrect blood pressure value:** Option D presents a blood pressure of 125/85 mm Hg, which is higher than the normal range for both SBP and DBP.

**Clinical Pearl:** It is essential for healthcare professionals to monitor blood pressure regularly and manage hypertension appropriately to prevent complications like stroke, heart attack, and heart failure. Understanding the normal blood pressure range and the classification of hypertension (Stage 1, Stage 2, or Stage 3) is crucial for making correct diagnoses and formulating treatment plans.

**Correct Answer:** D. 125/85 mm Hg

**Explanation:** A blood pressure measurement of 125/85 mm Hg falls within the Stage 1 hypertension range for systolic blood pressure (SBP) and is higher than the normal range for diastolic blood pressure (DBP). Stage 1 hypertension is defined as SBP between 130-139 mm Hg and DBP between 80-89 mm Hg.