+70 D A -70 Time in msec The diagram above shows the changes in membrane potential measured from a single point in a typical mammalian motor neuron that has been artificially stimulated to threshold....

Extracted text: +70 D A -70 Time in msec The diagram above shows the changes in membrane potential measured from a single point in a typical mammalian motor neuron that has been artificially stimulated to threshold. Membrane potential in mV B


Extracted text: A. Tetrodotoxin (TTX) is a neurotoxin derived from the rough-skinned newt we met earlier in the quarter (the one that poisons garter snakes that eat it). TTX selectively blocks voltage-gated Na+ channels. Which point on the graph above would change the most if the neuron were treated with TTX, and how would it change? B. In the TTX experiment described above, assume the muscle cell is in a separate dish and is not exposed to the TTX directly. In this case, a muscle cell that was the target of the motor neuron would_ o contract normally o contract for a longer time than normal o contract for a shorter time than normal o fail to contract