According to the model of voltage-gated sodium channels, there is no current through the channel during the initial part of the falling phase, because: a. a globular part of the channel is blocking the pore.
b. the voltage sensor (S4) has closed the pore.
c. the concentration of sodium ions inside the cell is so high that it prevents more ions from entering

Areheat rankine cycle operates with water as the working fluid. steam enters the first turbine at 8 mpa and 450°c and exits at 0.8 mpa. it is then reheated to 400°c before entering the second turbine, where it exits at 10 kpa. if the amount of work into the pump is 8.04 kj/kg and the net work per cycle produced is 1410.25 kj/kg, determine the thermal efficiency of the cycle.