Fred is studying his notes from anatomy class. one list in his notes describes features of a cns structure. anterior horns and posterior horns gray matter inside, white matter outside hippocampus central canal fred thinks this list contains an error. which of the statementsb below best describes the error? a. most items are features in the brain, but the gray and white matter locations correspond to the spinal cord. b. most items are features in the brain, but the horns are in the spinal cord. c. most items are features in the spinal cord, but the central canal is in the brain. d. most items are features in the spinal cord.

D) Most items are features in the spinal cord, but the hippocampus is in the brain.

the answer that best describes the relative refractory period in the neuron is the resting membrane potential is restored, but concentrations of sodium and potassium are not restored to their original state.

the refractory period is the time during which another stimulus given to the neuron will not lead to a second potential. thus, because na+ channels are inactivated during this time, additional depolarizing stimuli do not lead to new action potentials.  

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materials water oxygen those are the things i can think of in this moment.