Which of the following statements concerning epithelial cell surfaces is false?
A. Smooth surfaces reduce friction.
B. Epithelium with folded surfaces can change shape.
C. Epithelial cells with microvilli are involved in absorption.
D. Cilia propel materials along the surface of an epithelial cell.
E. Epithelium with folded surfaces tends to be very rigid.
Answer: E
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A. anterior pituitary; posterior pituitary B. hypothalamus; thyroid C. pituitary glands; thyroid D. posterior pituitary; hypothalamus E. anterior pituitary; hypothalamus
In the Krebs cycle, citric acid is followed by ________ acid.
Fill in the blank(s) with the appropriate word(s).
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