Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

_______ keep fluid from leaking between cells.

  1. a. Tight junctions
  2. b. Adhering junctions
  3. c. Gap junctions
  4. d. Fibroblasts

Summary Introduction

Introduction: The body tissues contain a group of specialized cells that can organize as organs. The epithelial tissue is a type of tissue that helps to cover the surface of the body and line its internal cavities and tubes. The major functions of the epithelial cells are for secretion, absorption, protection, and sensing. There are mainly three different types of cell junctions in vertebrate cells—tight, anchoring, and gap junctions.


Reason for correct answer:

The region where the two nearby cell membranes connect together with the help of transmembrane proteins such as occludins and claudins to form a barrier is called as tight junction. The tight junctions bring together the cell membrane in order to prevent the fluids from leaking in between the cells. For example, tight junctions join the epithelial cells that line the intestinal tract. Tight junctions act as selective barriers to diffusion of molecules through cell membrane. Transmembrane proteins form paracellular pores making the junction selectively permeable through which specific molecules pass across tight junctions.

Option a. is given as “tight junctions”.

Tight junctions are the type of cell junctions where two adjacent cells join together and constitute barrier. These are connected by transmembrane proteins including occludins and claudins. They prevent passing of molecules in between cells by binding the cells together.

Hence, the correct answer is option a.

Reason for incorrect answer:

Option b. is given as “adhering junctions”.

Adhering junctions are leaky channels that connect two cells through the transmembrane proteins for the exchange of molecules...

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