A brush border of microvilli, specialized for the active transport of small molecules across trans-porter proteins in the cell membrane, is typically found in which type of epithelium?
a. Pseudostratified columnar epithelium
b. Simple columnar epithelium
c. Simple squamous epithelium
d. Stratified squamous epithelium
e. Transitional epithelium
ANS: B
Simple columnar epithelial cells, e.g., in the intestine or gallbladder, frequently possess a brush border of microvilli that enhances active absorption of molecules from the lumen. See 2-5.
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The movement that brings the tip of the distal phalanx of the thumb into contact with the tip of the distal phalanx of the little finger is termed ________.
Fill in the blank(s) with the appropriate word(s).
The cytoplasm of a skeletal muscle fiber is called the
A) Sarcolemma. B) Sarcomere. C) Sarcosome. D) Sarcoplasmic reticulum. E) Sarcoplasm
Atrial natriuretic peptide causes ________ of afferent arterioles and ________ of mesangial cells.
A. constriction; contraction B. dilation; contraction C. constriction; relaxation D. dilation; relaxation
From proximal to distal, what bones form the upper limb? 1. carpals 2. humerus 3. metacarpals 4. phalanges 5. ulna and radius
A) 2, 5, 1, 3, 4 B) 5, 2, 1, 3, 4 C) 2, 5, 1, 4, 3 D) 2, 5, 4, 3, 1