Why does the reflux of gastric contents into the esophagus occur?
a. increased amounts of mucous produced by the stomach.
b. increased hydrochloric acid production by the parietal cells.
c. relaxation of the cardiac sphincter.
d. spasms of the submucosal layer of the stomach wall.
e. contraction of the pyloric sphincter.
Answer: c. relaxation of the cardiac sphincter.
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The hair cells of the utricle and saccule are clustered in
A) ampullae. B) cristae. C) ampullary cupulae. D) maculae. E) otoconia.
A person loses all vision in their left eye. One possible cause could be damage to the
A. optic chiasma. B. left optic tract. C. optic nerve in the left eye. D. right lateral geniculate nucleus. E. right visual cortex in the occipital lobe.
You would find pseudostratified columnar epithelium lining the
A) male reproductive tract.
B) urinary bladder.
C) secretory portions of the pancreas.
D) surface of the skin.
E) stomach.
The plasma membrane consists primarily of
A. sugars and proteins. B. phospholipids and nitrogenous bases. C. phospholipids and proteins. D. sugars and starches.