NSG 3280 EXAM 4 2026/2027 WITH ACTUAL
CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS |CURRENTLY TESTING
QUESTIONS AND SOLUTIONS|ALREADY
GRADED A+|NEWEST |BRAND NEW VERSION!!|
|JUST RELEASED
Parasympathetic stimulation of the heart generally leads to a decrease in heart rate,
because acetylcholine
a. increases intracellular cAMP levels and opens calcium channels.
b. opens potassium channels allowing potassium ion efflux.
c. binds and blocks ß receptors on the cell membrane.
d. inhibits voltage-gated sodium channels in the membrane.
b. opens potassium channels allowing potassium ion efflux.
One role of ATP in cardiac muscle contraction is:
a. providing energy to pump calcium into the cell.
b. inducing a conformational change in tropomyosin.
c. altering myosin affinity for actin-binding sites.
d. releasing sequestered calcium from the sarcoplasmic reticulum.
altering myosin affinity for actin-binding sites.
In lead II of a normal electrocardiogram (ECG), the Q wave is a downward deflection
resulting from - depolarization.
a. atrial
b. apical
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,c. Lateral wall
d. septal
d. septal
Which physiologic change increases cardiac work but does not enhance cardiac output?
a.Increased preload
b. Increased heart rate
c. Increased contractility
d. Increased afterload
d. Increased afterload
Which is a true statement about the effect of the Frank-Starling law on the heart?
a. Increased diastolic stretching of myocardial fibers produces increased stroke volume.
b. Sympathetic activation leads to increased myocardial contractility and heart rate.
c. An increase in heart chamber diameter increases myocardial wall tension.
d. An increase in coronary artery diameter results in less rapid coronary blood flow.
a. Increased diastolic stretching of myocardial fibers produces increased stroke volume.
Myocardial cells are connected by gap junctions enabling them to:
a.all be stimulated simultaneously.
b. function as a coordinated syncytium.
c. be affected by the autonomic nervous system.
d. share ATP.
b. function as a coordinated syncytium.
Cardiac myosin has a high affinity for actin when the myosin has what molecule(s) bound
to
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,it?
a. Calcium
b. ATP
c. ADP and phosphate
d. Creatine phosphate
c. ADP and phosphate
At very high heart rates, cardiac output
a. decreases.
b. increases.
C. stays the same.
d. reverses.
a. decreases
A patien yaia myocardial infartion involving the left atrium. Which coronary artery was:
a. Right coronary artery
b. Left coronary artery
c. Posterior coronary artery
d. Left circumflex artery
d. Left circumflex artery
Which is an important role of nitrous oxide (NO)?
a. It is a potent vasodilator.
b. It is a potent vasoconstrictor.
c. It synthesizes troponin.
d. It binds actin to myosin.
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, a. It is a potent vasodilator.
Which proteins are associated with the thin filament in the cardiac muscle? (Select all that
apply.)
a. Actin
b. Titin
c. Nebulin
d. Troponin
e. Myosin
a. Actin
c. Nebulin
d. Troponin
Electrical currents that travel through the heart are called vectors because they include
which components? (Select all that apply.)
a. Direction
b. Polarity
c. Magnitude
d. Vascularity
e. Ionic waves
a. Direction
c. Magnitude
The major wave complexes of an ECG include which of the following? (Select all that
apply.)
a. P wave
b. B wave
c. TUV complex
4|Page
CORRECT QUESTIONS AND VERIFIED
DETAILED ANSWERS |CURRENTLY TESTING
QUESTIONS AND SOLUTIONS|ALREADY
GRADED A+|NEWEST |BRAND NEW VERSION!!|
|JUST RELEASED
Parasympathetic stimulation of the heart generally leads to a decrease in heart rate,
because acetylcholine
a. increases intracellular cAMP levels and opens calcium channels.
b. opens potassium channels allowing potassium ion efflux.
c. binds and blocks ß receptors on the cell membrane.
d. inhibits voltage-gated sodium channels in the membrane.
b. opens potassium channels allowing potassium ion efflux.
One role of ATP in cardiac muscle contraction is:
a. providing energy to pump calcium into the cell.
b. inducing a conformational change in tropomyosin.
c. altering myosin affinity for actin-binding sites.
d. releasing sequestered calcium from the sarcoplasmic reticulum.
altering myosin affinity for actin-binding sites.
In lead II of a normal electrocardiogram (ECG), the Q wave is a downward deflection
resulting from - depolarization.
a. atrial
b. apical
1|Page
,c. Lateral wall
d. septal
d. septal
Which physiologic change increases cardiac work but does not enhance cardiac output?
a.Increased preload
b. Increased heart rate
c. Increased contractility
d. Increased afterload
d. Increased afterload
Which is a true statement about the effect of the Frank-Starling law on the heart?
a. Increased diastolic stretching of myocardial fibers produces increased stroke volume.
b. Sympathetic activation leads to increased myocardial contractility and heart rate.
c. An increase in heart chamber diameter increases myocardial wall tension.
d. An increase in coronary artery diameter results in less rapid coronary blood flow.
a. Increased diastolic stretching of myocardial fibers produces increased stroke volume.
Myocardial cells are connected by gap junctions enabling them to:
a.all be stimulated simultaneously.
b. function as a coordinated syncytium.
c. be affected by the autonomic nervous system.
d. share ATP.
b. function as a coordinated syncytium.
Cardiac myosin has a high affinity for actin when the myosin has what molecule(s) bound
to
2|Page
,it?
a. Calcium
b. ATP
c. ADP and phosphate
d. Creatine phosphate
c. ADP and phosphate
At very high heart rates, cardiac output
a. decreases.
b. increases.
C. stays the same.
d. reverses.
a. decreases
A patien yaia myocardial infartion involving the left atrium. Which coronary artery was:
a. Right coronary artery
b. Left coronary artery
c. Posterior coronary artery
d. Left circumflex artery
d. Left circumflex artery
Which is an important role of nitrous oxide (NO)?
a. It is a potent vasodilator.
b. It is a potent vasoconstrictor.
c. It synthesizes troponin.
d. It binds actin to myosin.
3|Page
, a. It is a potent vasodilator.
Which proteins are associated with the thin filament in the cardiac muscle? (Select all that
apply.)
a. Actin
b. Titin
c. Nebulin
d. Troponin
e. Myosin
a. Actin
c. Nebulin
d. Troponin
Electrical currents that travel through the heart are called vectors because they include
which components? (Select all that apply.)
a. Direction
b. Polarity
c. Magnitude
d. Vascularity
e. Ionic waves
a. Direction
c. Magnitude
The major wave complexes of an ECG include which of the following? (Select all that
apply.)
a. P wave
b. B wave
c. TUV complex
4|Page
