2 notecards = 1 page (4 cards per page)
1. The mediastinum is the medial cavity of the
2. The layers of the heart wall are the endocardium, the myocardium,
and the epicardium. The epicardium is also called the visceral layer
of the serous pericardium. This is surrounded by the
3. The serous fluid decreases friction caused by movement of the layers against one another.
4. Thestructures are (a) aorta, (b) pulmonary trunk, (c) left
atrium, (d) right atrium,
5. The papillary muscles and chordae tendineae keep the AV valve flaps from everting into the atria as the ventricles contract.
6. The mitral (left atrioventricular)
7. The right side of the heart acts as the pulmonary
8. (a) True. The left ventricle wall is
(b) True. The left ventricle pumps blood at much
(c) False. Each ventricle pumps the same amount of blood with each beat. If this were not true, blood would back up in either the systemic or pulmonary circulation (because the two ventricles are in series).
9. The branches of the right coronary artery are the
10. (a) The refractory period is almost as long as the contraction
in cardiac muscle. (b) The source of Ca?+ for the contraction is only
SR in skeletal muscle. (c) Both skeletal muscle
12. Cardiac muscle cannot go into tetany because the absolute
refractory period is almost as long as
13. (a) The QRS wave occurs during ventricular
14. It is not necessary for the intrinsic conduction system to
contact each individual cardiac myocyte. This is because cardiac
myocytes are connected to each other by gap junctions and so are
depolarized when an adjacent myocyte depolarizes.
16. The second heart sound is associated with the closing of the semilunar valves.
17. The murmur of mitral insufficiency occurs during ventricular
systole (because this is when the valve should be closed,
19. Exercise activates the sympathetic
20. If the heart is beating