Which branch(es) of the right coronary artery extends toward the apex along the

Question

Which branch(es) of the right coronary artery extends toward the apex along the anterior surface of the right ventricle and continues across the posterior surface of the heart? A) circumflex branch B) posterior interventricular branch C) atrial branches D) right marginal branch E) anterior interventricular branch Which of the following structures is a large, thin-walled vein that lies in the posterior portion of the coronary sulcus? A) posterior veins of left ventricle B) middle veins of left ventricle C) aortic sinus D) great cardiac vein E) coronary sinus Valves of the heart open and close due to ____ A) contraction of papillary muscles B) timing sequences C) electrical signals D) pressure changes E) None of the answers are correct. Which coronary vein receives blood from the posterior surfaces of the right atrium and ventricle? A) small cardiac vein B) middle cardiac vein C) coronary sinus D) anterior cardiac vein E) posterior vein of left ventricle Which of the following is a major component of the conduction system located in the interventricular septum, and extends toward the apex of the heart? A) SA node B) bundle branches C) AV node D) Purkinje fibers E) intermodal pathways

Explanation / Answer

23. The answer is the Right marginal branch. It is the artery coming out of right coronary artery and follows the acute margin of the heart and supplies to both surfaces of the right ventricle.

24. The answer is the coronary sulcus which is a thin walled vein that lies in the posterior portion of the coronary silcus and empties into the right atrium.

25. The closure and opening of heart valves are due to the pressure difference on the two sides of the valve.

26. The coronary sinus is the distal portion of the great cardiac vein that feeds into the right atrium.

27. Bundle branches are important in conducting the nerve impulse to the apex of the heart.

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