The paranasal sinuses:
a. are lined with mucosa continuous with the nasal cavity
b. help lighten the weight of the skull bones
c. act as resonant chambers for sound
d. all of the above
d. all of the above
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Compared to spinal nerves, how specialized are cranial nerves?
A. More specialized B. Less specialized C. Equally specialized D. Depends on age
The C shape of the tracheal cartilages is important because
A) large masses of food can move through the esophagus. B) large masses of air can pass through the trachea and thus the bronchi. C) it facilitates turning of the head. D) the bronchi are also C-shaped. E) it permits the trachea to pinch shut prior to sneezing.
Lactase is an enzyme that digests lactose
Indicate whether this statement is true or false.
Enlarged blood vessels of the anal columns are called
A. diarrhea. B. flatulence. C. hemorrhoids. D. peritonitis.