The correct answer is A.
Systolic pressure is the pressure in the arteries when the heart beats. It is the first number in a blood pressure reading, such as 120/80.
Diastolic pressure is the pressure in the arteries when the heart is at rest between beats. It is the second number in a blood pressure reading.
A normal blood pressure reading for adults is less than 120/80 mmHg. A blood pressure reading of 140/90 mmHg or higher is considered high blood pressure.
High blood pressure is a major risk factor for heart disease, stroke, and kidney disease. It is important to control high blood pressure through lifestyle changes and medication, if necessary.
Here is a brief explanation of each option:
- Option A: The letter A indicates systolic pressure.
- Option B: The letter B indicates diastolic pressure.
- Option C: The letter C indicates both systolic and diastolic pressure.
- Option D: The letter D indicates neither systolic nor diastolic pressure.