When performing experiments in which you are finding the effect of agonists on a particular tissue, it is essential that the length of time the tissue is exposed to an agonist is the same for all agonists used.
Length Of Time Must Be Constant Throughout An Experiment
The length of time depends on factors such as what tissue is being used and what drugs are being used.
Length of Time May Vary Between Different Experiments
In this simulation, the length of time that the guinea pig ileum will be exposed to an agonist is set at half a minute.