The pupil.
D000221:Adaptation, Ocular; D001341:Autonomic Nervous System / Q000502:physiology; D001921:Brain / Q000033:anatomy & histology; D001927:Brain Diseases / Q000150:complications; D003042:Cocaine / Q000494:pharmacology; D003215:Conditioning, Eyelid; D004402:Dysautonomia, Familial / Q000150:complications; D004644:Emotions; D004837:Epinephrine / Q000494:pharmacology; D005901:Glaucoma / Q000150:complications; D006801:Humans; D007500:Iritis / Q000150:complications; D008027:Light; D008297:Male; D008570:Memory, Short-Term; D011680:Pupil / Q000033:anatomy & histology / Q000187:drug effects / Q000294:innervation / Q000502:physiology / Q000503:physiopathology; D012018:Reflex; D003336:Tectum Mesencephali; D014276:Trigeminal Nerve / Q000502:physiology; D014786:Vision Disorders / Q000503:physiopathology
D003042:Cocaine; D004837:Epinephrine