The hearing receptors are located in the
A) ampulla.
B) cochlear duct.
C) utricle.
D) saccule.
E) semicircular canals.
B) cochlear duct.
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Ventilation is increased the most by a small
a. increase in arterial PCO2. b. decrease in arterial PCO2. c. increase in arterial PO2. d. decrease in arterial PO2. e. none of these answers.
In which part of the cell cycle do chromosomes align along the equator?
A. Anaphase B. Metaphase C. Prophase D. Interphase E. Telophase
Which type of muscle cell exhibits a longer refractory period?
A. Cardiac muscle cell B. Skeletal muscle cell
Gastrin, histamine, endorphins, serotonin, cholecystokinin, and somatostatin are hormones or paracrines that are released directly into the lamina propria. Which of the following cell types synthesize and secrete these products?
A) enteroendocrine cells B) parietal cells C) zymogenic cells D) mucous neck cells