During the cardiac cycle, when does systolic blood pressure occur?
When all heart valves are open simultaneously.
When the ventricles relax and fill with blood.
When the atria contract and eject blood into the ventricles.
When the heart contracts and forces blood into the aorta and pulmonary arteries.
The Correct Answer is D
Choice A reason: The valves of the heart do not open simultaneously during the cardiac cycle. In fact, for the heart to effectively pump blood, there must be a sequence where the atrioventricular valves close before the semilunar valves open, preventing the backflow of blood and ensuring forward circulation.
Choice B reason: The relaxation phase of the cardiac cycle is known as diastole. During this phase, the myocardium is relaxed, allowing the ventricles to fill with blood from the atria. This is associated with diastolic blood pressure, which is the lowest pressure in the arteries during the cardiac cycle.
Choice C reason: Atrial contraction occurs during the final phase of diastole, often referred to as the "atrial kick." This phase completes ventricular filling but is not responsible for generating systolic blood pressure, which is the peak pressure exerted against arterial walls during ventricular ejection.
Choice D reason: Systolic blood pressure represents the maximum pressure exerted against the arterial walls during the contraction of the ventricles (systole). As the ventricular myocardium contracts and the semilunar valves open, blood is forcefully ejected into the aorta and pulmonary arteries, creating this peak pressure wave.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: A liver edge that is palpable 4 cm below the right costal margin is considered hepatomegaly, a pathological finding. In a healthy adult, the liver is generally not palpable, or it may be palpable just at or slightly below the costal margin upon deep inspiration; 4 cm is clinically significant.
Choice B reason: A soft, non-tender abdomen without palpable masses or involuntary guarding (rigidity) is the hallmark of a normal physical examination. This indicates the absence of intra-abdominal inflammation, significant organomegaly, or abnormal fluid collections, allowing for comfortable palpation by the examiner across all four quadrants.
Choice C reason: While normal aortic pulsations are sometimes visible in the epigastric region, specifically in thin individuals, it is not the standard "expected" finding in a general assessment. Visible pulsations must always be carefully evaluated to rule out an abdominal aortic aneurysm, making it a finding that requires further clinical correlation.
Choice D reason: A firm, rigid abdomen associated with rebound tenderness is a clinical sign of peritonitis, which is severe peritoneal inflammation. This is a medical emergency and is definitively not an expected finding; it indicates deep infection or visceral perforation requiring immediate surgical or medical intervention.
Correct Answer is D
Explanation
Choice A reason: The right ventricle receives deoxygenated blood from the right atrium through the tricuspid valve. It is responsible for pumping this deoxygenated blood into the pulmonary circulation via the pulmonary artery to be oxygenated in the lungs, not for receiving oxygenated blood from the veins.
Choice B reason: The right atrium receives deoxygenated systemic venous blood returning from the body via the superior and inferior vena cava. It serves as the initial collection chamber for the right side of the heart, which is dedicated to the pulmonary circulation circuit, not the systemic oxygenated circuit.
Choice C reason: The left ventricle receives oxygenated blood from the left atrium through the mitral valve. It is the thick-walled muscular chamber responsible for pumping this oxygenated blood out through the aorta to the rest of the systemic circulation to meet the body's metabolic demands.
Choice D reason: The left atrium is the receiving chamber for the four pulmonary veins, which carry oxygen-rich blood back to the heart from the lungs. This chamber holds the oxygenated blood before it passes through the mitral valve into the left ventricle for systemic distribution.
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