UAFS Physiology Exam 3 ACTUAL
QUESTIONS AND CORRECT ANSWERS
Which of the following causes a decrease in resistance in a vessel? - Correct
answers✔✔vasodilation
If the membranes of the cardiac muscle cells in the SA node become more permeable to
potassium ions, - Correct answers✔✔heart rate will decrease
Which cells act as the heart's pacemaker? Why are they the pacemaker cells? - Correct
answers✔✔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 __________. - Correct
answers✔✔blood away from the heart
According to the Frank-Starling law of the heart, the cardiac output is directly related to the -
Correct answers✔✔venous return
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
, atrial contraction - Correct answers✔✔PR segment
Why does the pressure in the arteries and arterioles fall as the blood moves away from the heart?
- Correct answers✔✔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? - Correct answers✔✔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? -
Correct answers✔✔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? -
Correct answers✔✔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 - Correct answers✔✔T wave
QUESTIONS AND CORRECT ANSWERS
Which of the following causes a decrease in resistance in a vessel? - Correct
answers✔✔vasodilation
If the membranes of the cardiac muscle cells in the SA node become more permeable to
potassium ions, - Correct answers✔✔heart rate will decrease
Which cells act as the heart's pacemaker? Why are they the pacemaker cells? - Correct
answers✔✔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 __________. - Correct
answers✔✔blood away from the heart
According to the Frank-Starling law of the heart, the cardiac output is directly related to the -
Correct answers✔✔venous return
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
, atrial contraction - Correct answers✔✔PR segment
Why does the pressure in the arteries and arterioles fall as the blood moves away from the heart?
- Correct answers✔✔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? - Correct answers✔✔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? -
Correct answers✔✔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? -
Correct answers✔✔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 - Correct answers✔✔T wave
