1.. Which of these statements is true? A. The left coronary artery is a branch o
ID: 3522049 • Letter: 1
Question
1.. Which of these statements is true? A. The left coronary artery is a branch of the left pulmonary vein. B. The coronary sinus returns blood to the left atrium. C. The coronary arteries arise from the pulmonary trunk. D. The great cardiac vein collects blood from the anterior surface of the heart. E. The pulmonary arteries carry blood to the left atrium. 2. These vessels transport blood to the right and left lungs. A. aorta B. right atrium C. pulmonary trunk D. pulmonary arteries E. pulmonary veins 3. The cardiac electrical impulse normally begins spontaneously in the SA node because A. of the superior location of the SA node in the right atrium. B. the SA node is the only area of the heart capable of spontaneous depolarization. C. of the rich sympathetic innervation of the SA node. D. this area depolarizes more rapidly than any other portion of the conduction system. E. of action potentials from the cardioregulatory center 4. The action potentials are slowed at the AV node to allow the A. ventricles to repolarize. B. ventricles to completely empty of blood C. pacemaker to reset for the next beat. D. atria to complete their contraction. E. atria to begin their contraction. 5. Which of the following areas of the conduction system would produce spontaneous act most frequently if the SA node were not functioning? A. AV bundle B. Purkinje fibers C. AV node D. bundle branch E. the pacemakerExplanation / Answer
1. The great cardiac valve collects blood from the anterior surface of the body.
2. Pulmonary vein are the vessels transport blood to the right and left lungs
3. Cardiac impulse generated from SA node because of this area depolarizes more rapidly than any other position of the conduction system.
4. Action potential slowed at AV node to allow atria to complete their contraction.
5. If SA node were not functioning then AV node takes its place then Purkinje fibres and bundle branch.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.