©EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
Straighterline A&P II Quiz 2 Exam
Questions 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 - 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. - 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
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ALL RIGHTS RESERVED.
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. continuing to have open calcium channels.
d. closure of chloride channels.
e. closing of calcium channels. - answer✔c. continuing to have open calcium channels.
2|Page
ALL RIGHTS RESERVED.
Straighterline A&P II Quiz 2 Exam
Questions 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 - 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. - 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
1|Page
, ©EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
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. continuing to have open calcium channels.
d. closure of chloride channels.
e. closing of calcium channels. - answer✔c. continuing to have open calcium channels.
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