(i) The strength and number of beats of heart 1 before and after vagus nerve stimulation was recorded. What changes would you expect to observe? (ii) A sample of the Ringer solution was removed from beaker I and transferred to beaker 2. How would this affect the strength and number of beats of heart 2? (iii) The substance in the Ringer solution of beaker 1 was given a name 'vagusstoff' by Otto Loewi. What is 'vagussoff"?

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