Chapter 21: The heart

Chapter 21: The heart

Complete Chapter Questions With Answers

Sample Questions Are Posted Below

MULTIPLE CHOICE

1. Delayed after-depolarizations in cardiac tissue typically result from an increased influx of

1. sodium
2. potassium
3. calcium
4. chloride
5. sodium and potassium

Answer c: calcium

1. The re-excitation of cardiac tissue prior to the next cardiac impulse occurs in the process known as

1. re-entry
2. ectopic automaticity
3. atrioventricular block
4. atrial fibrillation
5. bradycardia

Answer a: re-entry

1. In persons with atrial fibrillation, digoxin may slow the ventricular rate by

1. decreasing sinoatrial node automaticity
2. increasing ventricular contractility
3. inhibiting the Na⁺/K⁺ pump
4. reducing the calcium transient
5. slowing atrioventricular conduction

Answer e: slowing atrioventricular conduction

1. Sotalol exerts an antiarrhythmic effect primarily by

1. slowing ventricular conduction
2. blocking sodium channels
3. slowing atrioventricular conduction
4. increasing the effective refractory period
5. decreasing action potential duration

Answer d: increasing the effective refractory period