BIOL 1344 Study Guide - Comprehensive Final Exam Guide - Water, Sodium, Aldosterone
20 Nov 2018
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There can be electrical signals; very fast-acting (few milliseconds); their effects last for a short amount of time (few seconds or minutes) Within electrical signals, there is action potential: complete reversal of polarity (aka depolarization) Can travel long distances along and strength (voltage) does not fade with time and space. Action potential is generated by voltage-gated na+ channels. Fade over time and space; they can be depolarizing or hyperpolarizing type. If there was a cell, the inside would be negative and outside would be positive at - Cell can go from -70mv ---> -50mv ----> -30mv ----> 0mv ----> +20mv (+20mv is called action potential, -50mv - -20mv is called graded potentials (depolarizing type)) At this point, the cell inside is positive and outside is negative (cell gets depolarized) When the cell becomes more negative (from -70mv---> -90mv) it is called hyperpolarization. At -90mv, it is called graded potential (hyperpolarizing type)
