Action potentials are generated whenever a depolarization increases the membrane potential to a) Threshold level b) Refractory period c) Equilibrium level d) Resting potential 42) A vasectomy is the tying off or excision of a small section of theto prevent sperm from leaving the body a) Urethra b) Vas deferens c) Testis d) Prostate 43) What are the part(s) of the central nervous system? a) Brain b) Spinal cord c) Both brain and spinal cord

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