JavaScript is disabled in your browser.
Clicking the Submit Answers for Grading button below will result in an error and your answers will be cleared. Please enable JavaScript before submitting your quiz for grading. Consult your browser's Help feature for information on enabling JavaScript.
Lab Quiz
Cardiovascular Physiology
Lab Quiz
This activity contains 20 questions.
Refer to Activity 2: Investigating the Refractory Period of Cardiac Muscle. What are extra systoles?
Extra beats that show up riding on the atrial relaxation peak.
Extra beats that show up riding on the ventricular relaxation period.
Extra beats that show up riding on the atrial contraction peak.
Extra beats that show up riding on the ventricular contraction peak.
Refer to Activity 2: Investigating the Refractory Period of Cardiac Muscle. During which portion of the cardiac cycle was it possible to induce an extra systole?
During the repolarization period.
During the depolarization period.
During the relaxation period.
During the refractory period.
Was it possible to tetanize the heart by administering multiple electrical shocks to the muscle at the rate of 20 stimuli/sec.?
No, the heart could not be tetanized.
Yes, complete tetanus occurred.
The results were inconclusive.
Yes, incomplete tetanus occurred.
Why is it important that the heart muscle cannot be tetanized?
Tetanization would make the heart ineffective as a pump.
The heart would produce inadequate force with each contraction.
The heart pump rate would become unstable.
It would cause the force of each contraction to be too great.
Refer to Activity 3: Examining the Effect of Vagus Nerve Stimulation. What is the initial effect of vagal stimulation on the heart rate?
It causes a decreased heart rate and decreased force of contraction.
It causes an increased heart rate and increased force of contraction.
It causes a decreased heart rate and increased force of contraction.
It causes an increased heart rate and decreased force of contraction.
Refer to Activity 4: Assessing the Effect of Temperature. What change occurred with the cold 5°C Ringer's solution?
It had no effect on the heart rate.
It caused an increase in the heart rate.
It stopped the heart.
It decreased the heart rate.
What change occurred with the warm 32°C Ringer's solution?
It did not affect the heart.
It stopped the heart.
It increased the heart rate.
It caused a decrease in the heart rate.
What can be said about the relationship between heart rate and temperature? Choose all that apply:
Decreasing the temperature increases the heart rate.
Temperature has no effect on heart rate.
Increasing the temperature decreases the heart rate.
Increasing temperature increased the heart rate.
Refer to Activity 5: Assessing the Effect of Pilocarpine. What happened when the heart was bathed in the pilocarpine solution?
The heart rate stopped.
The heart rate decreased.
There was no change in the heart rate.
The heart rate increased.
Refer to Activity 6: Assessing the Effect of Atropine. What was the effect of atropine on the heart?
It increased the heart rate.
It stopped the heart.
It decreased the heart rate.
It did not affect the heart rate.
Atropine is ____________ to pilocarpine, whereas atropine and pilocarpine are both ____________ in their effects on heart activity.
agonistic ; antagonistic
antagonistic ; agonistic
agonistic ; agonistic
antagonistic ; antagonistic
Refer to Activity 7: Assessing the Effect of Epinephrine. What was the effect of epinephrine on heart rate?
It increased the heart rate and the force of contraction.
It increased the heart rate and decreased the force of contraction.
It decreased the heart rate and decreased the force of contraction.
It decreased the heart rate and the force of contraction.
It had no effect on heart rate but increased the force of contraction.
What do the effects of epinephrine mimic?
The effects of the somatic nervous system.
The effects of the parasympathetic nervous system.
The effects of the peripheral nervous system.
The effects of the sympathetic nervous system.
Refer to Activity 8: Assessing the Effects of Digitalis. What is the effect of digitalis on the heart?
Digitalis causes tachycardia.
Digitalis interacts with epinephrine to cause a heart attack.
Digitalis has no effect on the heart.
Digitalis increases the heart rate.
Digitalis slows and steadies the heart.
Refer to Activity 9: Assessing the Effect of Various Ions. How does calcium affect the heart rate?
Calcium decreases the heart rate.
Calcium increases the heart rate.
Calcium increases the strength of contraction.
Calcium decreases the strength of contraction.
How does sodium affect the heart rate?
Sodium decreases the strength and rate of contraction.
Sodium increases the strength of contraction only.
Sodium increases the rate of contraction only.
Sodium does not affect the heart.
How does potassium affect the heart rate?
Potassium weakens cardiac contractions.
Potassium decreases the heart rate.
Potassium strengthens cardiac contractions.
Potassium increases the heart rate.
Which of the ions did NOT produce arrythmia?
All of the ions produced arrythmias.
Sodium.
Potassium.
Calcium
What are ectopic pacemakers?
Pacemakers introduced into the heart muscle to stabilize the heart rate.
Pacemakers appearing at specific intervals in the heart muscle.
Pacemakers appearing at specific sites in the heart muscle.
Pacemakers appearing erratically and at abnormal sites in the heart muscle.
The spontaneous depolarization of the heart muscle in the absence of external stimulation is ___________, whereas the spontaneous depolarization-repolarization events that occur in a regular and continuous manner in cardiac muscle is called ___________.
tachycardia ; bradycardia
rhythmicity ; automaticity
bradycardia ; tachycardia
automaticity ; rhythmicity
The Clear Answers feature requires scripting to function. Your browser either does not support scripting or you have turned scripting off. So, the Clear Answers feature will not work. Note that you do not need to use the Clear Answers feature in order to use this site. You can change your answers for each question individually.
Your browser either does not support scripting or you have turned scripting off. Because of this, the answer choices will NOT appear in a different order each time the page is loaded, though that is mentioned below. Note that you do not need this feature to use this site.
Answer choices in this exercise appear in a different order each time the page
is loaded.
Copyright © 1995-2008, Pearson Education, Inc., publishing as Pearson Benjamin Cummings
Legal and Privacy Terms