Instead of being hurt, denying, defending himself, begging forgiveness, instead of remaining indifferent even—anything would have been better than what he did do—his face utterly involuntarily (reflex spinal action, reflected Stepan Arkadyevitch, who was fond of physiology)—utterly involuntarily assumed its habitual, good-humored, and therefore idiotic smile.
There are no more uses of "physiology" in the book.
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Individual physiology plays a major role in weight gain.
a professor of exercise physiology at the University