Chapter 19
20 Which of the following is true concerning the heart's conduction system? - Action potentials pass slowly through the atrioventricular node. - Action potentials pass slowly through the atrioventricular bundle. - Action potentials pass slowly through the subendocardial conducting network (Purkinje fibers). - Action potentials pass slowly through the ventricle wall. - Action potentials pass slowly through the bundle branches.
Action potentials pass slowly through the atrioventricular node.
24 What is the ability to rhythmically depolarize without outside stimulation called? - Autorhythmic - Automatic - Myogenic - Contractile - Autonomic
Autorhythmic
28 Which of the following is a recording of all nodal and myocardial action potentials in the heart? - MRI - ECG - HMRI - EEG - EMG
ECG
36 Describing the Role of Atrial Contraction T/F Atrial contraction accounts for most of the ventricular filling.
False
41 Describing Ventricular Systole T/F The beginning of ventricular systole is when blood flowing back toward the relaxed ventricles causes the semilunar valves to close.
False
42 Describing Atrial Contraction T/F The atria never contract due to passive ventricular filling.
False
46 Which of the following is the correct formula for calculating cardiac output? - HR x SV - HR + SV - HR/SV - HR - SV - HR-SV/SV
HR x SV
40 Which of the following is the correct sequence of events regarding the cardiac cycle? - Isovolumic contraction, isovolumic relaxation, ejection, passive ventricular filling, active ventricular filling - Isovolumic relaxation, isovolumic contraction, ejection, passive ventricular filling, active ventricular filling - Isovolumic contraction, ejection, isovolumic relaxation, passive ventricular filling, active ventricular filling - Isovolumic contraction, ejection, isovolumic relaxation, active ventricular filling, passive ventricular filling - Ejection, isovolumic relaxation, passive ventricular filling, isovolumic contraction, active ventricular filling
Isovolumic contraction, ejection, isovolumic relaxation, passive ventricular filling, active ventricular filling
2 What is the double-walled sac that surrounds the heart called? -Pericardium -Epicardium -Pericardial cavity -Endocardium -Fibrocardium
Pericardium
19 Which of the following is the correct sequential path of an action potential in the heart? - Sinuatrial node, atrioventricular node, atrioventricular bundle, bundle branches, subendocardial conducting network (Purkinje fibers) - Atrioventricular node, sinuatrial node, atrioventricular bundle, bundle branches, subendocardial conducting network (Purkinje fibers) - Atrioventricular bundle, atrioventricular node, sinuatrial node, bundle branches, subendocardial conducting network (Purkinje fibers) - Subendocardial conducting network (Purkinje fibers), atrioventricular bundle, atrioventricular node, sinuatrial node, bundle branches - Atrioventricular node, sinuatrial bundle, atrioventricular node, bundle branches, subendocardial conducting network (Purkinje fibers)
Sinuatrial node, atrioventricular node, atrioventricular bundle, bundle branches, subendocardial conducting network (Purkinje fibers)
38 Which of the following is caused by ventricular contraction? - Blood flows into the ventricles. - Blood flows out of the atria. - The atrioventricular valves close, and then the semilunar valves open. - The semilunar valves close, and then the atrioventricular valves open. - Pressure becomes greater in the aorta and pulmonary trunk as compared to inside the ventricles.
The atrioventricular valves close, and then the semilunar valves open.
33 Which of the following statements is not true regarding ventricular systole? - The ventricles contract - The atrioventricular valves close. - The semilunar valves open. - The ventricles relax. - Blood flows through the aorta and the pulmonary trunk.
The ventricles relax.
21 Recalling the Cardiac Action Potential Pathway T/F In the ventricles, the action potential travels along the interventricular septum to the apex of the heart, where it then spreads superiorly along the ventricle walls.
True
22 Recalling the Role of the Subendocardial Conducting Network T/F Action potentials are carried by the subendocardial conducting network (Purkinje fibers) from the bundle branches to the ventricular walls.
True
23 Describing Cardiac Muscle and Fatigue T/F Cardiac muscle is not prone to fatigue because it makes little use of anaerobic fermentation or the oxygen debt mechanism.
True
37 Describing the Timing of Ventricular Filling T/F The ventricles begin to fill during ventricular diastole.
True
45 If the right ventricle begins to pump an increased amount of blood, this soon arrives at the left ventricle, stretches it more than before, and causes it to increase its stroke volume and match that of the right. This is an example of __________. - preload - afterload - contractility - cardiac reserve - None of the choices are correct
preload
18 In the heart, an action potential originates in the __________. - subendocardial conducting network (Purkinje fibers) - bundle branches - atrioventricular bundle - atrioventricular node - sinuatrial node
sinuatrial node
39 When the pressure in the ventricles becomes lower than the pressure in the atria, __________. - the ventricles contract - blood flows into the pulmonary trunk - blood flows into the aorta - the atrioventricular valves open - the semilunar valves open
the atrioventricular valves open
34 The semilunar valves close during __________. - ventricular systole - ventricular diastole - atrial systole - atrial diastole - both atrial and ventricular systole
ventricular diastole
35 The atrioventricular valves open during __________. - ventricular systole - ventricular diastole - atrial systole - atrial diastole - both atrial and ventricular systole
ventricular diastole
4 What are the thick inferior chambers of the heart that pump blood into the arteries called? What are the thick inferior chambers of the heart that pump blood into the arteries called? - Ventricles - Atria - Auricles - AV valves - Trabeculae cameae
Ventricles