Ch 18 - Matching & T/F
1) The myocardium receives its blood supply from the coronary arteries.
T
14) As pressure in the aorta rises due to atherosclerosis, more ventricular pressure is required to open the aortic valve.
T
15) Proxysmal atrial tachycardia is characterized by bursts of atrial contractions with little pause between them
T
3) Anastomoses among coronary arterial branches provide collateral routes for blood delivery to the heart muscle.
T
4) Congestive heart failure means that the pumping efficiency of the heart is depressed so that there is inadequate delivery of blood to body tissues.
T
5) Tissues damaged by myocardial infarction are replaced by connective tissue.
T
6) The left side of the heart pumps the same volume of blood as the right.
T
7) Chronic release of excess thyroxine can cause a sustained increase in heart rate and a weakened heart.
T
9) Trabeculae carneae are found in the ventricles and never the atria.
T
Match the following: A) Epicardium B) Parietal layer C) Myocardium D) Endocardium 14) The inner lining of the heart. 15) Heart muscle. 16) Serous layer covering the heart muscle. 17) The outermost layer of the serous pericardium.
14. D 15. C 16. A 17. B
Match the following: A) Purkinje fibers B) AV bundle C) SA node D) AV node 18) The pacemaker of the heart. 19) Found in the interventricular septum. 20) Network found in the ventricular myocardium. 21) The point in the conduction system of the heart where the impulse is temporarily delayed.
18. C 19. B 20. A 21. D
Match the following: A) Pulmonary valves B) Aortic valve C) Mitral valve D) Tricuspid valve 22) Prevents backflow into the left ventricle. 23) Prevents backflow into the right atrium. 24) Prevents backflow into the left atrium. 25) Prevents backflow into the right ventricle. 26) AV valve with two flaps. 27) AV valve with three flaps.
22. B 23. D 24. C 25. A 26. C 27. D
Match the following: A) Ischemia B) Ectopic focus C) Quiescent period D) Infarction E) Fibrillation 33) Heart muscle is deprived of oxygen. 34) Death of heart muscle cells. 35) A condition of rapid and irregular or out-of-phase contraction of heart muscle cells. 36) An abnormal pacemaker. 37) Total heart relaxation
33. A 34. D 35. E 36. B 37. C
10) The "lub" sounds of the heart are valuable in diagnosis because they provide information about the function of the heart's pulmonary and aortic valves.
F
11) Autonomic regulation of heart rate is via two reflex centers found in the pons.
F
13) An ECG provides direct information about valve function.
F
2) Cardiac muscle has more mitochondria and depends less on a continual supply of oxygen than does skeletal muscle.
F
21) The papillary muscles contract after the other ventricular muscles so that they can take up the slack on the chordae tendineae before the full force of ventricular contractions sends blood against the AV valve flaps
F
8) Arterial blood supply to heart muscle is continuous whether the heart is in systole or diastole.
F
