Labyrinthitis causes motion sickness because it inflames the bony canals that transmit perilymph through this structure. For 10 points each:
[10m] Name this section of a larger body organ, the home of the body’s vestibular system. Motion sickness occurs when the eyes and this structure pass contradictory signals to the brain.
ANSWER: inner ear [or internal ear; or auris interna; prompt on ear by asking, “Can you be more specific?”; prompt on cochlea by asking, “What larger body organ is that a part of?”]
[10e] The vestibular system and the eyes synchronize with one of these involuntary motions. Gagging is another example of these rapid responses to stimuli that do not require brain involvement.
ANSWER: reflexes [or vestibulo-ocular reflex; or gag reflex]
[10h] Antiemetics treat motion sickness by antagonizing this compound’s receptors. Fluoxetine prevents this compound from being reabsorbed by presynaptic neurons.
ANSWER: serotonin [or 5-hydroxytryptamine or 5-HT]
<Victor Prieto, Science - Biology> ~19162~ <Editor: Adam Silverman>