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Title: i was wondering if someone can help with PhysioEX 9.0 exercise 6 Post by: jrodri8 on Oct 5, 2011 I am having trouble with understanding some of the questions. i completed the majority of the lab but was having trouble with activity 1.
Activity 1: investigating the refractory period of cardia muscle Explain why the larger waves seen on the oscilloscope represent ventricular contractions? Explain why the amplitude of the wave did not change when you increased the frequency of the stimulation. (relate your response to the refractory period of the cardiac action potential.) Why is only possible to induce an extra systole during relaxation? Explain why wave summation and tetanus are not possible in cardiac muscle tissue. activity 2: Examine the effects of Vagus nerve stimulation What will happen to the heart rate if the vagus nerve was cut? i believe the answer is it would increase but im not really sure. Activity 3: Examining the effects of temperature on heart rate Describe why Ringer's solution is required to maintain heart contractions. I think it because it is required to keep an isolated, intact heart viable. activity 5: examine the effects of various ions on heart rate describe how medicines called calcium blockers are used to treat patients why? Title: Re: i was wondering if someone can help with PhysioEX 9.0 exercise 6 Post by: how_mendel on Oct 5, 2011 Explain why the larger waves seen on the oscilloscope represent ventricular contractions? The ventricles are larger chambers therefore, when they contract they generate more force thus producing a larger wave. Title: Re: i was wondering if someone can help with PhysioEX 9.0 exercise 6 Post by: how_mendel on Oct 5, 2011 Why is only possible to induce an extra systole during The extrasystole did not occur until relaxation and so we could not achieve wave summation or tetanus. Title: Re: i was wondering if someone can help with PhysioEX 9.0 exercise 6 Post by: jrodri8 on Oct 5, 2011 thank you!
Title: Re: i was wondering if someone can help with PhysioEX 9.0 exercise 6 Post by: how_mendel on Oct 5, 2011 |