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doseofmegan doseofmegan
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10 years ago
We did not dissect a frog in class, but our professor wants us to answer these questions. Any help would be greatly appreciated  Slight Smile

  • Which region of the dissected frog had the highest intrinsic rate of contraction?
  • The greatest regularity or rhythmicity?
  • How do these properties correlate with the duties of a pacemaker?
  • Is this region the pacemaker of the frog heart?
  • Which region had the lowest intrinsic rate of contraction?

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Staff Member
10 years ago
Quote from: doseofmegan (10 years ago)
Which region had the lowest intrinsic rate of contraction?

I'm guessing the ventricle.

Quote from: doseofmegan (10 years ago)
Which region of the dissected frog had the highest intrinsic rate of contraction?

I'm guessing the sinus venosus. In addition, this region would have the greatest automaticity and rhythmicity.

Quote from: doseofmegan (10 years ago)
Is this region the pacemaker of the frog heart?

Yes.

The human pacemaker (SA node) has automaticity, rhythmicity, and the highest depolarization rate in the heart.

- Duddy
- Master of Science in Biology
- Bachelor of Science
doseofmegan Author
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#2
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10 years ago
You are a great help, Duddy. Have a marvelous day, friend  Slight Smile
If you are reading this, you are awesome, and I wish you a happy and prosperous day!
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#3
Staff Member
10 years ago
You're welcome.
- Master of Science in Biology
- Bachelor of Science
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