Which of the following best describes the relationship between blood pressure, peripheral resistance, and blood flow?
Blood flow decreases with increased blood pressure.
Blood pressure increases as peripheral resistance increases.
Peripheral resistance increases with decreased blood flow.
Peripheral resistance decreases with increased blood pressure.
The Correct Answer is B
A. Blood flow decreases with increased blood pressure:
Increased blood pressure alone does not necessarily decrease flow; flow depends on pressure gradient and resistance.
B. Blood pressure increases as peripheral resistance increases:
Blood pressure is directly proportional to cardiac output and peripheral resistance (BP = CO × PR). Vasoconstriction increases resistance, raising arterial pressure, while vasodilation lowers it.
C. Peripheral resistance increases with decreased blood flow:
Resistance depends on vessel diameter and viscosity, not directly on blood flow.
D. Peripheral resistance decreases with increased blood pressure:
Peripheral resistance can remain constant or increase; increased blood pressure does not automatically decrease resistance.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Supplies the lateral wall of the left ventricle:
The circumflex artery branches from the left coronary artery and supplies the lateral and posterior walls of the left ventricle as well as part of the left atrium. This supply is crucial for maintaining effective left ventricular contraction and overall cardiac output.
B. Supplies the right ventricle:
The right ventricle is primarily supplied by the right coronary artery, not the circumflex artery. Misidentifying this can affect understanding of infarct locations.
C. Supplies the interventricular septum:
The interventricular septum is mainly supplied by the LAD artery, which is critical for coordinating left ventricular contraction.
D. Supplies the right atrium:
The right atrium is primarily supplied by the RCA, not the circumflex artery. Understanding arterial supply is important for predicting conduction system involvement in MI.
Correct Answer is D
Explanation
A. To facilitate blood flow from ventricles to the lungs:
Blood flow to the lungs occurs via the pulmonic valve and pulmonary artery, not the AV valves.
B. To prevent blood from flowing into the coronary arteries:
Coronary arteries receive blood from the aortic sinuses, independent of AV valves. AV valves do not regulate coronary perfusion.
C. To regulate blood flow between the two ventricles:
Blood does not flow directly between ventricles. AV valves regulate flow from atria to ventricles, not between ventricles.
D. To prevent backflow of blood into the atria:
The mitral and tricuspid valves prevent backflow of blood into the atria during ventricular contraction (systole), ensuring unidirectional blood flow and efficient cardiac output.
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