Straighterline A&P II Quiz 2 with Complete Solutions
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Course
Straighterline A&P
Institution
Straighterline A&P
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 repolarizat...
Straighterline A&P II Quiz 2 with Compl ete Solutions What event(s) occur during the Q RS 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 -Answer -d. depolarization of t he 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. -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. -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. -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. -Answer -a. the resting membrane potential is hyperpolarized. Which vessels empty blood into the left atrium? a. aorta b. right atrium c. pulmonary trunk d. pulmonary arteries e. pulmonary veins -Answer -e. pulmonary veins The plateau phase seen during the action potential of a cardiac muscle cell is due to the a. sodium -potassium pump. b. opening of sodium channels. c. co ntinuing to have open calcium channels. d. closure of chloride channels. e. closing of calcium channels. -Answer -c. continuing to have open calcium channels. When a pacemaker potential in the SA node reaches threshold, a. the permeability to K+ ions incre ases. b. many voltage -gated Ca2+ channels open. c. voltage -gated Ca2+ channels close. d. RMP has been restored. e. permeability of the cell does not change. -Answer -b. many voltage -gated Ca2+ channels open. The AV valve that is located on the same side of the heart as the origin of the aorta is the a. bicuspid or mitral valve. b. tricuspid valve. c. aortic semilunar valve. d. pulmonary semilunar valve.
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