Solved by a verified expert:Atrioventricular (AV) block1.A first degree block is caused by ________________.a. delay of the action potential between the AV node and Purkinje fibersb. delay of the action potential between the AV and SA nodesc. delay of the action potential between the SA node and Purkinje fibersd. delay of the action potential between the SA and AV nodes2. The rate of ventricular conduction is best determined by the _______________________ on a ECG.a. the number of P waves present within a specific unit of timeb. the number of T waves present within a specific unit of timec. the number of QRS complexes present within a specific unit of time3. An ECG tracing from someone with a third-degree AV block is best described as a tracing with a ______________________.a. 1:1 ratio of P waves to QRS complexesb. 1:1 ratio of T waves to QRS complexesc. 1:2 ratio of P waves to QRS complexesd. 2:1 ratio of P waves to QRS complexesInotropic Agents1. Positive inotropes allow the heart to pump ____________ blood with fewer heart beats. They do this by _____________________ the end-systolic volume (ESV).a. less, increasingb. more, increasingc. less, decreasingd. more, decreasing2. An individual with high blood pressure (hypertension) is expected to benefit from the administration of ____________________ inotropic drugs that _______________ the hearts workload.a. positive; decreaseb. negative; increasec. positive; increased. negative; decrease3. The expected effect of the drug Digoxin is to _________________ ventricular contraction and _________________ stroke volume.a. strengthen; increaseb. strengthen; decreasec. weaken; decreased. weaken; increaseHeart valve structure and function1. The AV valves close in response to the ________________________.a. contraction of the ventricles and the resulting drop in ventricular pressureb. contraction of the atria and the resulting rise in atrial pressurec. contraction of the atria and the resulting drop in atrial pressured. contraction of the ventricles and the resulting rise in ventricular pressure2. Action potentials received directly from ________________ stimulate the papillary muscles to contract allowing for the proper _______________ of the AV valves.a. AV node; closingb. Purkinje fibers; openingc. AV node; openingd. Purkinje fibers; closing3. Mitral valve prolapse severe enough to cause regurgitation may directly cause _________________ pressure in the ____________ atrium.a. decreased; leftb. decreased; rightc. decreased; rightd. increased; right
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