Neurophysiology exam questions with correct answers

In comparing autonomic and somatic efferent neuron input to muscle, which of the following is True? CORRECT ANSWER-Autonomic efferent neurons can be excitatory or inhibitory. The "power stroke" is due to the flexing of the myosin head group forcing the movement of actin. What molecular event produces myosin's power stroke? CORRECT ANSWER-Release of Pi from myosin What is found in the central canal of the normal, healthy spinal cord? CORRECT ANSWER-cerebral spinal fluid This glial cell produces the myelin sheaths around axons of neurons in the central nervous system. CORRECT ANSWER-Oligodendrocytes What is the mechanism of action of cocaine? CORRECT ANSWER-Blocks reuptake of dopamine A neuron contains open sodium and potassium channels. The sodium reversal potential is +60 mV, the potassium reversal potential is -90 mV. If the cell membrane potential is -60 mV,