Consider the following neural circuit when answering questions 22 through 25. Furthermore assume that the neuro transmitter substance from any presynaptic structure alters the RMP of its postynaptic structure by 10 m volts. Also, assume that the excitability threshold of each structure is 20 m volts.

For Questions 44 to 52

Suppose that you have a preparation in which a muscle is being directly stimulated with an electrical current and you are recording a form curve. The following represents those data.