Question: A heart receives a signal to beat every second. If the voltage when the signal arrives is below 50 micro volts, the heart beats and

A heart receives a signal to beat every second. If the voltage when the signal arrives is below 50 micro volts, the heart beats and increases its voltage by 30 micro volts. If the voltage when the signal arrives is greater than 50 micro volts, the heart does not beat and the voltage does not change. The voltage of the heart decreases by 25% between beats in either case.
a. Suppose the voltage of the heart is 40 micro volts right after one signal arrives. What is the voltage before the next signal, and will the heart beat?
b. Graph the updating function for the voltage of this heart.
c. Will this heart exhibit normal beating or some sort of AV block?

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