Which sequence best describes the direction of blood flow through the heart and lungs?
Vena cava → Right atrium → Right ventricle → Lungs → Pulmonary artery → Left atrium → Left ventricle.
Right atrium → Right ventricle → Pulmonary vein → Lungs → Pulmonary artery → Left atrium → Left ventricle.
Right atrium → Right ventricle → Pulmonary artery → Lungs → Pulmonary vein → Left atrium → Left ventricle.
Right atrium → Right ventricle → Lungs → Pulmonary vein → Pulmonary artery → Left atrium → Left ventricle → Vena cava.
The Correct Answer is C
Choice A rationale
This sequence is incorrect because it suggests that blood goes from the lungs to the pulmonary artery, which is not accurate. The pulmonary artery carries deoxygenated blood from the heart to the lungs.
Choice B rationale
This sequence is incorrect because it suggests that blood goes from the pulmonary vein to the lungs, which is not accurate. The pulmonary vein carries oxygenated blood from the lungs to the heart.
Choice C rationale
This sequence correctly describes the direction of blood flow through the heart and lungs. Deoxygenated blood enters the right atrium, goes to the right ventricle, then is sent to the lungs via the pulmonary artery. After picking up oxygen in the lungs, the blood returns to the heart via the pulmonary vein, entering the left atrium, then the left ventricle, from where it is pumped out to the rest of the body.
Choice D rationale
This sequence is incorrect because it suggests that blood goes from the pulmonary vein to the pulmonary artery, which is not accurate. The pulmonary vein carries oxygenated blood from the lungs to the heart, and the pulmonary artery carries deoxygenated blood from the heart to the lungs.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
Choice A rationale
Orthostatic hypotension, a form of low blood pressure that happens when you stand up from sitting or lying down, would not typically cause severe chest pain or result in elevated levels of cardiac troponins I and T6.
Choice B rationale
Raynaud’s disease, a condition that causes some areas of your body — such as your fingers and toes — to feel numb and cold in response to cold temperatures or stress, would not typically cause severe chest pain or result in elevated levels of cardiac troponins I and T6.
Choice C rationale
Angina, a type of chest pain caused by reduced blood flow to the heart, could cause severe chest pain, but it would not typically result in elevated levels of cardiac troponins I and T6. Elevated troponin levels are more indicative of damage to the heart muscle, which is not characteristic of angina.
Choice D rationale
A myocardial infarction (MI), also known as a heart attack, could cause severe chest pain and would typically result in elevated levels of cardiac troponins I and T7. Troponins are proteins found in the heart muscle, and levels can rise in the blood when there is damage to the heart, such as during an MI.
Correct Answer is A
Explanation
Choice A rationale
The apical pulse, also known as the point of maximal impulse (PMI), is located at the fifth intercostal space at the left midclavicular line. This is the location where the heartbeat is strongest and is the standard location for assessing the apical heart rate.
Choice B rationale
Placing the stethoscope directly over the heart on the sternum is not the standard method for assessing the apical heart rate. While the sternum is close to the heart, it is not the location where the heartbeat is strongest or most easily heard.
Choice C rationale
The right side at the midclavicular line, fourth intercostal space, is not the standard location for assessing the apical heart rate. The heart is located more towards the left side of the chest, and the apical pulse is typically not as easily heard on the right side.
Choice D rationale
The midaxillary line on the left side is not the standard location for assessing the apical heart rate. While this location is on the left side of the chest, it is not where the heartbeat is strongest or most easily heard.
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