A toxin that acts on the intestine is called an enterotoxin
a. true
b. false
a. true
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Sessile and sedentary reef dwellers include
a. sponges and cnidarians. b. crustaceans. c. many molluscs. d. fish. e. cephalopods.
If a person has been prescribed eyeglasses with lenses that shorten the path of light, the correction is for
A. farsightedness. B. nearsightedness. C. astigmatism. D. cross-eyed vision. E. None of the answer choices is correct.
Recently, a new concept has been introduced in the view of tumors and tumor cells. It suggests that a relatively small number of cells scattered throughout the tumor are responsible for maintaining the tumor and promoting its spread. Such cells are known as ___________.
a) cancer stem cells b) anthropomorphic cells c) tumorific cells d) tumorlogenous cells
The P wave of the ECG represents
A. the depolarization of the atria. B. the relaxation of the atria. C. the contraction of the ventricle. D. the repolarization of the atria. E. the contraction of the atria.