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 B
Explanation
The correct answer is B. Systolic pressure less than 120 mmHg and diastolic pressure less than 80 mmHg is considered normal blood pressure in adults according to current guidelines. A systolic pressure between 140-150 mmHg (option A) would be classified as stage 1 hypertension, while a systolic pressure greater than 140 mmHg and diastolic pressure of 100 mmHg (option D) would be classified as stage 2 hypertension. A systolic pressure less than 100 mmHg regardless of diastolic pressure (option C) would be considered low blood pressure.
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