PhysioEx 9.0 Exercise 6 help

Got some of this figured out but would appreciate some help.  Thank you !!

Activity 2

1.  Explain the effect that extreme vagus nerve stimulations had on the heart?

2.  Explain two ways that the heart can overcome exessive vagal stimulation?

3.  Describe how the sympathetic and parasympathetic nervous systems work together to regulate heart rate?

4.  What do you think would happen to the heart rate if the vagus nerve was cut?


Activity 3

1.  Explain the effect that decresing the temperature had on the frog heart?  How do you think the human heart would respond?

2.  Describe why Ringers solution is required to maintain heart contractions?

3.  Explain the effect that increasing the temperature had on the frog heart?  How do you think the human heart would respond?