BIO.CH.20.TEST - Question 1 0 out of 4 points David suffers...

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Unformatted text preview: Question 1 0 out of 4 points David suffers from a regurgitating mitral valve. This condition would cause Answer Selected Answer: increased cardiac output from the left ventricle. Correct Answer: fluid congestion in the lungs. P Question 2 4 out of 4 points Artery is to ________ as vein is to ________. Answer Selected Answer: efferent; afferent Correct Answer: efferent; afferent Question 3 4 out of 4 points The expandable extension of the atrium is the Answer Selected Answer: auricle. Correct Answer: auricle. Question 4 4 out of 4 points Intercalated discs convey the force of contraction from cell to cell and propagate Answer Selected Answer: action potentials. Correct Answer: action potentials. @ Question 5 4 out of 4 points In cardiac muscle, the depolarization phase of the action potential is the result of Answer Selected Answer: increased membrane permeability to sodium ions. Correct Answer: increased membrane permeability to sodium ions. @ Question 6 4 out of 4 points ________ is to contraction as ________ is to relaxation. Answer Selected Answer: Systole; diastole Correct Answer: Systole; diastole ` Question 7 4 out of 4 points The pulmonary semilunar valve guards the entrance to the Answer Selected Answer: pulmonary trunk. Correct Answer: pulmonary trunk. ` Question 8 4 out of 4 points Cardiac output would be greatest when Answer Selected Answer: sympathetic stimulation of the heart increases. Correct Answer: sympathetic stimulation of the heart increases. Question 9 4 out of 4 points Which of the following is greater? Answer Selected Answer: heart rate when norepinephrine is released at the SA node Correct Answer: heart rate when norepinephrine is released at the SA node Question 10 4 out of 4 points Most of the cells of the conducting system are ________ than the contractile cells of the myocardium and contain ________ myofibrils. Answer Selected Answer: smaller; few Correct Answer: smaller; few ` Question 11 4 out of 4 points Figure 20-1 The Heart Use Figure 20-1 to answer the following question(s): Identify the structure labeled "6." Answer Selected Answer: tricuspid valve Correct Answer: tricuspid valve 8 Question 12 4 out of 4 points When the left ventricle contracts, the diameter of the ventricular chamber Answer Selected Answer: decreases. Correct Answer: decreases. 8 Question 13 4 out of 4 points The cusps of atrioventricular valves are attached to papillary muscles by the Answer Selected Answer: chordae tendineae. Correct Answer: chordae tendineae. Question 14 4 out of 4 points The atrioventricular valve on the side of the heart that receives the superior vena cava is the ________ valve. Answer Selected Answer: tricuspid Correct Answer: tricuspid Question 15 4 out of 4 points There are ________ pulmonary veins. Answer Selected Answer: 4 Correct Answer: 4 Question 16 4 out of 4 points When the left ventricle contracts, the distance from the apex to the base Answer Selected Answer: decreases. Correct Answer: decreases. Question 17 4 out of 4 points The P wave of the ECG appears as the Answer Selected Answer: atria depolarize. Correct Answer: atria depolarize. Question 18 4 out of 4 points The pericardial fluid is important because it Answer Selected Answer: all of these Correct Answer: all of these Question 19 4 out of 4 points The circumflex branch and the anterior descending artery are branches of the Answer Selected Answer: left coronary artery. Correct Answer: left coronary artery. H Question 20 4 out of 4 points As a result of the long refractory period, cardiac muscle cannot exhibit Answer Selected Answer: tetany. Correct Answer: tetany. Question 21 4 out of 4 points The connective-tissue fibers Answer Selected Answer: all of these Correct Answer: all of these p Question 22 4 out of 4 points The entrance to the ascending aorta is guarded by the ________ valve. Answer Selected Answer: semilunar Correct Answer: semilunar 0 Question 23 0 out of 4 points The connective tissue of the epicardium at the interventricular and coronary sulci generally contains Answer Selected Answer: fat. Correct Answer: all of these 0 Question 24 4 out of 4 points The myocardium is primarily composed of ________ tissue. Answer Selected Answer: cardiac muscle Correct Answer: cardiac muscle Question 25 4 out of 4 points Damage to the chordae tendinae in the left ventricle may result in Answer Selected Answer: all of these Correct Answer: all of these ...
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