Although the algebra of rotations can get ugly, the main idea is that rotation through an appropriate angle will transform a general second-degree equation into an equation in and without an xy-term

Advanced Physiology Cumulative Final Study Guide Key: equations are highlighted Answers in red Things to remember are bold Exam 1 [Winters] – (modeled after exam B) 1. Given an axon with a length constant of 1 mm, a stimulus of 3 mV, the current at 2 mm from the stimulating electrode would be = 0.41 mV o (3 mV) x (0.137) = 0.41 mV 2. Given the table, to calculate the resting membrane potential (Vm): -4.0 mV o Vm = (-61.5) log [ (Kp)(K-ICF) + (NaP)(Na-ICF) + (ClP)(Cl-ECF) / (Kp)(K-ECF) + (NaP)(Na-ECF) + (ClP)(Cl-ICF) ] o Vm = (-61.5) log [ (120*80) + (10*10) + (50*120) / (120*100) + (10*100) + (50*10) Vm = (-61.5) log (15700/13