Campbell Biology in Focus; Modified Mastering Biology with Pearson eText -- ValuePack Access Card -- for Campbell Biology in Focus (2nd Edition)
Campbell Biology in Focus; Modified Mastering Biology with Pearson eText -- ValuePack Access Card -- for Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780134433776
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman
Publisher: PEARSON
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Chapter 4, Problem 12TYU
Summary Introduction

To discuss:

How the small intestinal epithelial cell structures that are viewed in SEM contribute to their specialized functions of nutrient absorption, and to explain how they act as a barrier between intestinal contents and the blood supply on the other side of the cell sheet.

Introduction:

Several layers such as the serous coat, the muscular coat, the outer longitudinal and inner circular linings, and the sub mucous coat are present in the small intestine.

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Tight junctions are protein junctions that provide a water-tight seal between cells. They ensure that materials must enter the cells (through diffusion or active transport) to pass through the tissue. Tight junctions are characteristic of cells lining the digestive tract, where materials are required to pass through cells (not between them) before they can travel into the blood. Can someone explain more clearly why lining the digestive tract?
A human pancreatic cell obtains O2—and necessary molecules such as glucose, amino acids, and cholesterol—from its environment, and it releases CO2 as a waste product. In response to hormonal signals, the cell secretes digestive enzymes. It also regulates its ion concentrations by exchange with its environment.  Based on the structure and function of cellular membranes, describe how such a cell accomplishes these interactions with its environment.
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Campbell Biology in Focus; Modified Mastering Biology with Pearson eText -- ValuePack Access Card -- for Campbell Biology in Focus (2nd Edition)

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