Knowing the three main variables regulating blood pressure are cardiac output, peripheral resistance, and blood volume, which of the following statements is false?
none of the above are false, all of the above are true
increase BV, increases BP
increase CO, increases BP
increase PR, increases BP
The Correct Answer is A
A. None of the above are false, all of the above are true: All the statements regarding blood pressure regulation are correct. Blood pressure rises with increased blood volume, cardiac output, or peripheral resistance, reflecting the direct relationships between these variables and arterial pressure.
B. Increase BV, increases BP: An increase in blood volume raises venous return, stroke volume, and ultimately cardiac output, leading to higher blood pressure. This relationship is a fundamental principle of cardiovascular physiology.
C. Increase CO, increases BP: Cardiac output, the product of heart rate and stroke volume, directly affects arterial pressure. When CO rises, more blood is pumped into the circulation per minute, increasing blood pressure if resistance remains constant.
D. Increase PR, increases BP: Peripheral resistance, determined largely by vessel diameter and blood viscosity, opposes blood flow. An increase in resistance requires higher pressure to maintain flow, thereby elevating blood pressure.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. 4:There are four pulmonary veins (two from each lung) that empty into the left atrium, not the right atrium. Pulmonary arteries do not enter the atria.
B. 2:The two pulmonary arteries (left and right) carry deoxygenated blood from the right ventricle to the lungs. They do not empty into the right atrium.
C. 7:There is no anatomical structure where seven pulmonary arteries empty into the right atrium. This number is incorrect.
D. 0:Pulmonary arteries never empty into the right atrium. They originate from the right ventricle and carry blood to the lungs for oxygenation, making zero the correct answer.
E. 1:There is no single pulmonary artery that empties into the right atrium; both arteries leave the right ventricle, so this is incorrect.
Correct Answer is A
Explanation
A. Veins only carry blood low in oxygen:This statement is false because pulmonary veins carry oxygenated blood from the lungs to the heart. Not all veins carry deoxygenated blood; the oxygen content depends on the circulation pathway.
B. Veins are our blood reservoirs:Veins are capacitance vessels that can hold large volumes of blood, acting as reservoirs. This property helps maintain circulatory stability and allows the body to adjust blood distribution as needed.
C. Blood pressure is low in veins:Venous pressure is significantly lower than arterial pressure because veins are farther from the pumping action of the heart and have thinner walls with less smooth muscle.
D. Veins have valves:Many veins, especially in the limbs, contain valves that prevent backflow and assist in returning blood to the heart against gravity. These valves are crucial for maintaining unidirectional flow.
E. There are no exceptions, all of the above are true:This is incorrect because statement A is false; veins do not exclusively carry deoxygenated blood.
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