7. The P wave of a normal EKG indicates: Ventricular depolarization. Ventricular

Question

7. The P wave of a normal EKG indicates: Ventricular depolarization. Ventricular repolarization Atrial depolarization Atrial repolarization a. b. 8. Blood within the pulmonary veins goes into the Lungs b. Right atrium c. Left atrium d. Aorta 9. The left ventricular wall of the heart is thicker than the right ventricular wall in order to: a. b. e d. Accommodate a greater volume of blood Expand the thoracic cage during diastole. Pump blood with greater pressure Pump blood through a smaller valve 10. Normal heart sounds are caused by which of the following? a. Excitation of the SA node b. Closure of the heart valves c. Friction of the blood against the chamber walls d. Contraction of ventricular muscle

Explanation / Answer

The P wave of normal electrocardiogram indicates atrial depolarization.This atrial depolarization leads to atrial contraction or atrial systole.And then P wave is nothing but the summation wave generated by depolarization front as it transits the atrium.

Blood within the pulmonary veins goes into lungs. Blood flows from venacava to right atrium, from there to right ventricle to pulmonary arteries to lungs to pulmonary veins to left atrium and then ventricle and then aorta.

The left ventricular wall of the heart is thicker than right ventricular wall in order to pump blood with great pressure. Basically left ventricular wall of heart has got thicker muscle wall than right ventricle.And the reason why the special feature is that.,left ventricle has to pump blood all the way around the body.Where as in case of right ventricle it has to pump only to lungs.

Normal heart sounds are caused by closure of valves.

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