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Chapter 5: Problem 30

If a person's blood pressure is \(115 \mathrm{mm}\) Hg over \(75 \mathrm{mm} \mathrm{Hg}\), the 75 represents a. systolic pressure. b. diastolic pressure. c. pressure during ventricular relaxation. d. Both b and c are correct.

Short Answer

Expert verified
The correct answer is d. Both b and c are correct, as 75 mm Hg represents the diastolic pressure and the pressure during ventricular relaxation.

Step by step solution

01

Understanding systolic and diastolic pressure

Blood pressure is typically measured as two numbers – systolic pressure (the top number) and diastolic pressure (the bottom number). Systolic pressure refers to the pressure in your arteries during the contraction of your heart muscle. Diastolic pressure refers to the pressure in your arteries when your heart muscle is resting between beats (the moment of highest relaxation). In this example, the systolic pressure is 115 mm Hg, and the diastolic pressure is 75 mm Hg.
02

Identifying pressure during ventricular relaxation

Ventricular relaxation refers to the phase in the cardiac cycle when the ventricles of the heart are at rest, and the pressure in the ventricles decreases. During ventricular relaxation, the diastolic pressure occurs as the pressure in the arteries is at its lowest. In this case, the pressure during ventricular relaxation would be represented by the bottom number, 75 mm Hg.
03

Comparing the options and selecting the correct answer

Now that we know the definitions of systolic and diastolic pressure and understand the pressure during ventricular relaxation, we can compare the options: a) Systolic pressure: This is incorrect as 75 mm Hg is the diastolic pressure. b) Diastolic pressure: This is correct, as 75 mm Hg is the diastolic pressure. c) Pressure during ventricular relaxation: This is also correct, as the diastolic pressure represents the pressure during ventricular relaxation (75 mm Hg). d) Both b and c are correct: This is the correct answer, as both b and c are accurate descriptions of what 75 mm Hg represents in this example. Thus, the correct answer is d. Both b and c are correct.

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