Straighterline A&P II Quiz 2 with complete solutions

Straighterline A&P II Quiz 2 with complete solutions What event(s) occur during the QRS complex of an ECG? a. depolarization of the atria b. repolarization of the ventricles c. depolarization of the atria and repolarization of the ventricles d. depolarization of the ventricles and repolarization of the atria -Correct Answer-d. depolarization of the ventricles and repolarization of the atria Blood in the pulmonary veins returns to the a. right atrium. b. left atrium. c. right ventricle. d. left ventricle. e. coronary sinus. -Correct Answer-b. left atrium. The "pacemaker" of the heart is the a. right bundle branch. b. left bundle branch. c. AV node. d. SA node. e. PM node. -Correct Answer-d. SA node. The great cardiac vein and middle cardiac vein empty into a venous cavity called the a. pulmonary vein. b. inferior vena cava. c. superior vena cava. d. coronary sinus. e. coronary artery. -Correct Answer-d. coronary sinus. Lowered extracellular potassium levels will lower the heart rate because a. the resting membrane potential is hyperpolarized. b. ectopic action potentials occur. c. action potential amplitude declines. d. more sodium channels open. e. it blocks calcium channels. -Correct Answer-a. the resting membrane potential is hyperpolarized. Which vessels empty blood into the left at