The surface area of the small intestine is dramatically increased due to the presence of ________ on the luminal surface.
A. smooth muscle
B. capillaries
C. lacteals
D. hydrolytic enzymes
E. villi and microvilli
Answer: E
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A. locomotion by extension of pseudopodia B. possession of hard shells C. tertiary symbiosis D. causing cancer E. conjugation
Urine flows from the ureters directly into the urethra. Indicate whether the statement is true or false
The stage of an infectious disease when specific signs and symptoms are seen and the pathogen is at peak activity is
A. convalescent stage. B. incubation period. C. prodromal stage. D. period of invasion. E. All of these choices are correct.
Which Helminth group contains members without a digestive system?
A) Phylum Nematoda B) Phylum Cestoda C) Class Cestoda D) Phylum Trematoda