If a blood clot lodges in a coronaryartery narrowed by atherosclerosis, theresult can be _____.
| a. | myocardial infarction |
| b. | ventricular fibrillation |
| c. | coronary arrest |
| d. | all of these are possible outcomes of a blood clot lodging in acoronary artery |
| a. | cannot be used to stabilize the heartbeat of a person with acardiac arrhythmia |
| b. | is powered by a battery that is usually implanted inside theheart |
| c. | delivers an electric shock intended to stop the heart frombeating |
| d. | performs a function similar to the sino-atrial node |
Which of the following statements about echo cardiograms isfalse?
| a. | they can be used to determine the ejection fraction produced bythe ventricles during systole |
| b. | they can be used to determine if the walls of the ventricles arethickened in response to hypertension |
| c. | they are considered “healthy” if the ejection fraction of theleft ventricle is greater than 40% |
| d. | they are made using low energy x-rays |
