Name Section a) Clearly the intracellular and extracellular environments, along with ion permeability, influence the profile of an action potential. On the diagram below, draw what you think an action potential would look in the following altered conditions. Label each action potential with the corresponding condition. 40m potential 5 4.4m Figure by MIT OCW i)The external Na concentration is lowered ii) The external K concentration is lowered iii)Scorpion toxin(slows the inactivation of Na channels)is added 7012Fall2003Name:___________________________________ Section:_____ 7.012 Fall 2003 2 Question 2 a) Clearly the intracellular and extracellular environments, along with ion permeability, influence the profile of an action potential. On the diagram below, draw what you think an action potential would look in the following altered conditions. Label each action potential with the corresponding condition. i) The external Na+ concentration is lowered. ii) The external K+ concentration is lowered. iii) Scorpion toxin (slows the inactivation of Na+ channels) is added. Rest potential 0 +40 mV -70 mV ∼∼ .5 ms Rest potential 0 +40 mV -70 mV ∼∼ .5 ms Rest potential 0 +40 mV -70 mV ∼∼ .5 ms Rest potential 0 +40 mV -70 mV ∼∼ .5 ms Rest potential 0 +40 mV -70 mV ∼∼ .5 ms Rest potential 0 +40 mV -70 mV ∼∼ .5 ms Rest potential 0 +40 mV -70 mV ∼∼ .5 ms Rest potential 0 +40 mV -70 mV ∼∼ .5 ms Rest potential 0 +40 mV -70 mV ∼∼ .5 ms ∼∼ 4.4 ms Figure by MIT OCW