Which chamber of the heart endures the highest pressures?
Right atrium
Left atrium
Left ventricle
Right ventricle
The Correct Answer is C
The left ventricle is responsible for pumping oxygenated blood out of the heart and into systemic circulation, which requires generating enough pressure to overcome the resistance of the systemic blood vessels. Therefore, the left ventricle has thicker and more muscular walls than the right ventricle and can generate higher pressures during contraction. In contrast, the right ventricle pumps deoxygenated blood to the lungs, which have lower resistance compared to the systemic circulation, and therefore do not need to generate as high pressures.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
In the normal electrocardiogram, the PR interval represents
The PR interval represents the time from the onset of atrial activation to the onset of ventricular activity. During this time, the electrical impulse travels through the atria, the atrioventricular (AV) node, and the bundle of His before entering the ventricles and initiating ventricular depolarization. Option A is incorrect because the atrial depolarization is represented by the P wave. Option B is incorrect because the ventricular depolarization is represented by the QRS complex. Option D is incorrect because there is no such term as “electrical systole” of the ventricles in ECG interpretation.
Correct Answer is C
Explanation
At high altitudes, the air pressure is decreased, and there is less oxygen available in each breath. This leads to a decreased partial pressure of oxygen in the lungs, which can cause hypoxemia (low oxygen levels in the blood). Hyperventilation may initially help to increase oxygen delivery to the body, but it can also lead to respiratory alkalosis and decrease oxygen delivery to the tissues in the long run.
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