67) You identify a new neurotransmitter and call it Jerrionin. In order to characterize the actions of this neurotransmitter, you conduct an experiment in which you stimulate the Jerrionin- containing neuron while recording the postsynaptic current using voltage clamp. You get the following results: EPSC (NA) 500 -300 -100 -110 1 127.31 3 4 time (ms) a) On the graphing paper provided, draw the Current-Voltage curve for this response b) What is the reversal potential for the Jerrionin receptor? Vm (mv) -45 -60 -70 -75 2 5 6

The leaves of a tree lose water to the atmosphere via the process of transpiration. A particular tree loses water at the rate of 4.0 x 10-8 m3/s. What mass of water is lost over the course of a single day? (Use 1000 kg/m3 for the density of water). 3.456 v kg This water is replenished by the upward flow of sap through vessels in the tree's trunk. If the trunk contains about 1800 vessels, each 0.1 mm in diameter, what is the speed of the sap flowing in the vessels? 0.243 x mm/s

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Opening of voltage-gated channels is driven by an intramembrane electric field acting on charged voltage-sensor domains. These domains move across the membrane and generate gating (displacement) currents. When these currents are integrated over time, they produce the gating charge generated by a population of channels. What would be the gating charge passing through the external circuit when the flat array of charges moves across the distance a inside the membrane? The hydrophobic thickness of the membrane is d, the dielectric constant ɛ, the density of charges is O and the area of the membrane is A (provide an analytic solution). start end A A a d d