Exercises 434? picture a voltage clamp that shifts from H" at -6[} or? to V," = 15 mV. At rst the clamp is perfonned with the annual composition of [Na].- = 15 mM and [N a]... = 130 mM. 43. The early current is carried by which ion. and crossing in which direction? 44. The star-adjusters current is carried by which ion. and crossing in which direction? 45. If the voltage clamp is repeated such that the sodium current is abolished. what extracellular medium changes are necessary? {Be specic and quantitative.) 45. If the voltage clamp at 1?]... = 15 ml! is conducted with 10% sodium seawater {[l'ila] = 13.0 mMJ. how does the sodium current magnitude and time course compare with that under normal conditions? [Be specic and quantitative.) 4?. How does the potassium ion ow compare during the voltage clamp under nonnal. zero sndntm flux. [0% sodium seawater conditions