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Physio Ex 9.0 - Exercise 6
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StaceyD
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Hi, I am having problems with exercise 6 in Physio Ex 9.0 -- any help would be appreciated.

Activity 1
5. Explain why the larger waves seen on the oscilloscope represent ventricular contractions.
6. Explain why the amplitude of the wave did not change when you increased the frequency of the stimulation.  (HINT: Relate your response to the refractory period of the cardiac action potential.)
7. Why is it only possible to induce an extra systole during relaxation.
8. Explain why wave summation and tetanus are not possible in cardiac muscle tissue.

Activity 2
15. What do you think would happen to the heart rate if the vagus nerve were surgically cut?

Activity 4
28. Describe the benefits of administering digitalis.
29. Distinguish between cholinergic and adrenergic chemical modifiers.  Include examples of each in your discussion.

Activity 5
36. Describe how medicines called “calcium channel blockers” are used to treat patients and why?


Thank you everyone

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Reply# 1
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Physio Ex 9.0 - Exercise 6
Sep 5, 2011

What is the exercise name? Sorry, we're using PhysioEx 8 right now, which have different exercise titles.



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Physio Ex 9.0 - Exercise 6
Sep 7, 2011

Cardiovascular Physiology

Activity 1 is: Investigating the Refractory Period of Cardiac Muscle
Activity 4 is: Examining the Effects of Chemical Modifiers on Heart Rate
Activity 5 is: Examining the Effects of Various Ions on Heart Rate

Thank you!



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Physio Ex 9.0 - Exercise 6
Sep 7, 2011

Activity 1 is: Investigating the Refractory Period of Cardiac Muscle

Do these answers correspond to the questions?

Activity 2: Investigating the Refractory Period of Cardiac Muscle (pp. 75–76)



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Physio Ex 9.0 - Exercise 6
Sep 8, 2011

Kind of, the answers your gave me only partially answer the questions. Number 2 asks why this is and number 4 on my labs also asks about summation along with tetanus so the answer you gave me answered half of my question.

Thank you for your help!



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Physio Ex 9.0 - Exercise 6
Sep 8, 2011

Kind of, the answers your gave me only partially answer the questions. Number 2 asks why this is and number 4 on my labs also asks about summation along with tetanus so the answer you gave me answered half of my question.

Thank you for your help!

StaceyD, the reason why is because that's what is only available to instructors. The other half isn't included, like you suggested.



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