PCCN Review Questions and answers

PCCN Review Questions and answers 1. D Rationale: "Endo," meaning "within" is associated with the innermost lining of the heart, so eliminate A. The myocardium is associated with the heart's middle layer, so eliminate option B. The "transcardium" is somewhat of a contrived term, so eliminate C as well. The prefix in pericardium, "peri," means "outside." Option D is the best answer. 1. Which of the following is the outermost lining of the heart? (A) Endocardium (B) Myocardium (C) Transcardium (D) Pericardium 2. C Rationale: The lateral LV wall is supplied by the circumflex and the sinus node is supplied by the RCA, so eliminate options A and B. It is atrial distension that stimulates the secretion of atrial natriuretic factor, so eliminate D as well. The coronary sinus is best known as the main venous drainage vessel of the heart, C is the best answer. 2. Which of the following statements regarding the coronary sinus is correct? (A) It provides arterial blood flow to the lateral LV wall. (B) It provides arterial blood flow to the sinus node. (C) It is the main venous drainage vessel of the heart. (D) It stimulates secretion of the atrial natriuretic factor. 3. D Rationale: Options A, B, and C all influence stroke volume (i.e., the mLs of blood the LV ejects with each beat). Preload reflects the filling of the LV, afterload is associated with the resistance to LV ejection, and contractility impacts the strength of which that volume is ejected. Secondarily, capillary