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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Tiny projections called _______ increase the surface area of a brush border cell

  1. a. villi
  2. b. microvilli
  3. c. cilia
  4. d. flagella

Summary Introduction

Introduction: Brush border is a membrane or a surface that is covered with microvilli over the epithelial cells found in certain locations like small intestine, large intestine, and kidney. Microvilli are the minute cellular membrane projections found in the epithelial cells of small intestine that increases the surface area and helps the nutrients to easily diffuse.

Explanation

Reason for the correct answer: Certain tiny projections found in a cell enlarge the surface area of and help in adhesion, absorptions and secretions.

Option b. is given as “microvilli”. Thousands of microvilli structures are found on the surfaces of epithelial cells to increase the absorption rate per cell.

Hence, the correct answer is option b.

Reasons for the incorrect answers:

Option a. is given as “villi”. Villus is a finger-like structure found on the small intestine. This is incorrect because villus has several microvilli that only increases the surface area...

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