UAFS PHYSIOLOGY EXAM 3
QUESTIONS WITH VERIFIED
ANSWERS. A+ GRADE 2025/2026.
Which of the following causes a decrease in resistance in a vessel? - ANS vasodilation
If the membranes of the cardiac muscle cells in the SA node become more permeable to
potassium ions, - ANS heart rate will decrease
Which cells act as the heart's pacemaker? Why are they the pacemaker cells? - ANS Cells of
the SA node are the usual pacemakers, because they are autorhythmic cells, and set the pace of
the heart rate.
Arteries are most accurately defined as blood vessels that carry __________. - ANS blood
away from the heart
According to the Frank-Starling law of the heart, the cardiac output is directly related to the -
ANS venous return
Match the name of the wave with the correlated event.
A. P wave
B. QRS complex
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, C. T wave
D. PR segment
E. ST segment
atrial contraction - ANS PR segment
Why does the pressure in the arteries and arterioles fall as the blood moves away from the
heart? - ANS friction causes a loss of energy
The anatomy of the intrinsic conduction system causes contraction of the ventricles to begin at
the apex and move superiorly. Why is this important? - ANS so blood is forced upward,
toward the semilunar valves
As blood flows away from the heart, how does overall blood pressure in vessels change? Why? -
ANS Blood pressure decreases, because of the effects of friction between the vessel walls
and the moving blood.
Through which valve must blood pass as it moves from the right atrium to the right ventricle? -
ANS tricuspid
Match the name of the wave with the correlated event.
A. P wave
B. QRS complex
C. T wave
D. PR segment
E. ST segment
ventricular repolarization - ANS T wave
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
QUESTIONS WITH VERIFIED
ANSWERS. A+ GRADE 2025/2026.
Which of the following causes a decrease in resistance in a vessel? - ANS vasodilation
If the membranes of the cardiac muscle cells in the SA node become more permeable to
potassium ions, - ANS heart rate will decrease
Which cells act as the heart's pacemaker? Why are they the pacemaker cells? - ANS Cells of
the SA node are the usual pacemakers, because they are autorhythmic cells, and set the pace of
the heart rate.
Arteries are most accurately defined as blood vessels that carry __________. - ANS blood
away from the heart
According to the Frank-Starling law of the heart, the cardiac output is directly related to the -
ANS venous return
Match the name of the wave with the correlated event.
A. P wave
B. QRS complex
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, C. T wave
D. PR segment
E. ST segment
atrial contraction - ANS PR segment
Why does the pressure in the arteries and arterioles fall as the blood moves away from the
heart? - ANS friction causes a loss of energy
The anatomy of the intrinsic conduction system causes contraction of the ventricles to begin at
the apex and move superiorly. Why is this important? - ANS so blood is forced upward,
toward the semilunar valves
As blood flows away from the heart, how does overall blood pressure in vessels change? Why? -
ANS Blood pressure decreases, because of the effects of friction between the vessel walls
and the moving blood.
Through which valve must blood pass as it moves from the right atrium to the right ventricle? -
ANS tricuspid
Match the name of the wave with the correlated event.
A. P wave
B. QRS complex
C. T wave
D. PR segment
E. ST segment
ventricular repolarization - ANS T wave
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
