Which of the following statements regarding the tonsils is correct?
A) The tonsils are located on the posterior nasopharyngeal wall.
B) The tonsils rarely become swollen enough to obstruct the airway.
C) The tonsils are comprised of lymphatic tissue and help to trap bacteria.
D) The tonsils are located in the anterior pharynx and filter bacteria.
Answer: C) The tonsils are comprised of lymphatic tissue and help to trap bacteria.
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Prostacyclin
a. activates the clotting cascade b. induces vasoconstriction of an injured vessel c. inhibits platelet aggregation d. is released by aggregated platelets e. dissolves the clot
Among the extant vertebrates, only the bony fishes (Osteichthyes) possess bone
(a) Why, then, do we make the assumption that the ancestors of cartilaginous fishes must have had bone that was subsequently lost? (b) Why don't we think this is true for the lampreys and hagfishes?
Which of the following is not an accessory gland that contributes fluid to the semen?
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