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1) The sites of olfactory transduction are the olfactory hairs, which are
A) cilia projecting from the dendrites of first-order neurons.
B) microvilli on the axons of first-order neurons.
C) columnar epithelial cells in the nasal mucosa.
D) mucus-producing cells in the nasal epithelium.
E) projection tracts between the thalamus and the temporal lobe.
2) G proteins activated by binding of odorant molecules to olfactory receptors cause
A) exocytosis of neurotransmitter.
B) activation of adenylate cyclase.
C) influx of calcium ions.
D) bending of olfactory hairs.
E) hyperpolarization of olfactory neurons.
3) First-order olfactory neurons synapse with second-order neurons in the
A) olfactory epithelium.
B) cribriform plate.
C) olfactory tract.
D) temporal lobe.
E) olfactory bulbs.
4) Olfactory sensations reach the brain via
A) cranial nerve I.
B) cranial nerve II.
C) cranial nerve VII.
D) cranial nerve VIII.
E) spinal nerves C1.

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