what are the limitations of the cell in preventing cell injuries? Explain. Identify the characteristics of action potentials in neurons. Identify all that apply a. Use of voltage-gated ion channels, refractory period, occur at Nodes of Ranvier b. Initiated at trigger zone, all or nothing amplitude, summation can occur C. Arise at dendrites/cell body, all or nothing amplitude, refractory period d. Use of voltage-gated ion channels, depolarizing then repolarizing, all or nothing e. Arise at trigger zones, depolarizing then hyperpolarizing, refractory period 50. Identify how hyperpolarization occurs during graded potentials. Identify all that apply a. Opening of K* channels and influx of K b. Opening of K* channels and efflux of K* c. Opening of Na channels and influx of Nat d. Opening of Nat channels and efflux of Nat e. Opening of Cl channels and influx of Cl-

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