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During the action potential, the neuron cannot be excited by a second stimulus; it is _______. For a few milliseconds afterward, the hyperpolarized neuron is _______, requiring a stronger stimulation than usual in order to fire.

LSD effects in lab animals differs from schizophrenia in that LSD appears to

Which of the following statements about external genitalia is true?

A collection of neurons in the nervous system is known as a

A treatment that increases the life span of lab animals is _______, which causes a(n) _______ in basal metabolism.

The chemical that Loewi initially called Vagusstoff turned out to be

In frogs and other amphibians, most of the information from the eyes is directed to the

Which of the following is not represented in primary visual cortex?

According to the monoamine hypothesis, depression is caused by

Prevalence rates for _______ are higher for women than for men.