19.2 True/False Questions
1) Sounds of the aortic valve are heard in the second intercostal space at the right sternal margin.
2) The correct sequence of heart wall layers from superficial to deep is epicardium, endocardium, and myocardium.
3) Heart block interferes with the ability of the ventricles to receive the pacing impulses of the conducting system.
4) Papillary muscles are horizontal ridges in the walls of the atrium.
5) Formation of the interatrial and interventricular septa occurs during the second month of embryonic development.
6) Prolapse of the atrioventricular valves is prevented by the chordae tendineae.
7) Oxygen-rich blood returning from the lungs enters the left atrium through two right and two left pulmonary veins.
8) Contraction of the heart proceeds first on the right side of the heart and second on the left.
9) The middle cardiac vein lies alongside the anterior interventricular artery.
10) The electrical event that begins each heartbeat occurs at the sinoatrial (SA) node.
11) Contraction of the ventricles begins at the apex and proceeds superiorly.
12) Parasympathetic fibers innervate the SA node, AV node, and cardiac musculature.
13) The right and left coronary arteries arise from the descending aorta.
14) The fibrous skeleton of the heart forces the transmission of electrical signals from the atria to the ventricles via the atrioventricular bundle.
15) Atherosclerosis in the marginal artery may cause ischemia in the left side of the heart.