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REVIEW SHEET
EXERCISE 6
Frog Cardiovascular Physiology
Name:
NAME:
LAB TIME/DATE:
Baseline Frog Heart Activity
The following questions refer to Activity 1: Recording Baseline Frog Heart Activity.
1. What was the baseline heart rate for the frog?
2. Which wave is larger, the one for atrial contraction or the one for ventricular contraction?
Why?
The following questions refer to Activity 2: Investigating the Refractory Period of Cardiac
Muscle.
3. At what time during the contraction cycle was it possible to induce an extrasystole?
4. By clicking the Multiple Stimulus button and delivering 20 stimuli/sec, were you able to
achieve tetanus? Why or why not?
The following questions refer to Activity 3: Examining the Effect of Vagus Nerve
Stimulation.
5. What happens to the heart rate with vagal stimulation?
6. What happens during vagal escape?
Assessing Physical and Chemical Modifiers of Heart Rate
The following questions refer to Activity 4: Assessing the Effect of Temperature.
7. List the frog heart rate for the following conditions:
_____ bpm with 5°C Ringer’s solution
_____ bpm with 32°C Ringer’s solution
8. Describe the effect of temperature on heart rate.
9. Did this effect match your prediction? Explain.
REVIEW SHEET
EXERCISE 6
Frog Cardiovascular Physiology
Name:
The following questions refer to Activity 5: Assessing the Effect of Pilocarpine.
10. What was the heart rate after treatment with pilocarpine?
_____ bpm with pilocarpine
11. Did this effect match your prediction? Explain.
The following questions refer to Activity 6: Assessing the Effect of Atropine.
12. What was the heart rate after treatment with atropine?
_____ bpm with atropine
13. Are the effects of pilocarpine and atropine the same or opposite?
The following questions refer to Activity 7: Assessing the Effect of Epinephrine.
14. What was the heart rate after treatment with epinephrine?
_____ bpm with epinephrine
15. Did this effect match your prediction? Explain.
16. What division of the autonomic nervous system does the addition of epinephrine imitate?
The following questions refer to Activity 8: Assessing the Effect of Digitalis.
17. What was the heart rate after treatment with digitalis?
_____ bpm with digitalis
18. Describe the effect that digitalis had on the heart.
The following questions refer to Activity 9: Assessing the Effect of Various Ions.
19. Which ions resulted in arrhythmia of the frog heart?
20. Which ion had the greatest effect on the frog heart? Explain.