The complex (wave) represents the sum of all ventricular muscle cell depolarizations
The Correct Answer is {"dropdown-group-1":"B"}
PR interval: the time it takes for the electrical impulse to travel from the sinoatrial (SA) node to the atrioventricular (AV) node
QT interval: the time it takes for ventricular depolarization and repolarization to occur
ST segment: the period between ventricular depolarization and repolarization, representing the plateau phase of the ventricular action potential.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Varicose veins occur when the valves within the veins, which normally prevent the backflow of blood, become damaged or weakened, allowing blood to pool and the veins to become enlarged and twisted. This can occur due to a variety of factors, including age, pregnancy, obesity, genetics, and prolonged periods of standing or sitting. An increase in hydrostatic pressure can contribute to the development of varicose veins, but it is not the primary cause.
Correct Answer is C
Explanation
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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