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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which of the following statements about the blood–brain barrier is incorrect?

a. It is formed of capillary walls that are composed of tight junctions.

b. It transports glucose to brain cells by means of transport proteins.

c. It allows alcohol to pass through its lipid bilayer.

d. Oxygen can move through the lipid bilayer.

e. It reduces blood supply to brain cells compared with otherbody cells.

Summary Introduction

Introduction:

Epithelial cells of the capillary wall form a highly selective semipermeable border that involves the separation of the circulating blood from the brain and extracellular fluid in the CNS (central nervous system), and is known as the blood–brain barrier. This barrier involves the movement of water, some gases, and liquid soluble molecules by passive diffusion.

Explanation

Justification/explanation for the correct answer:

Option (e) is “it reduces blood supply to the brain cell compared to other cells of the body.” The blood–brain barrier does not reduce blood supply to the brain cell as compared to the other body parts. Blood–brain barrier reduces the entry of unwanted suspended molecules of blood to the brain. It allows selective molecules to enter the brain by passive diffusion. So, it is an incorrect answer. Hence, option (e) is the correct answer.

Explanations for the incorrect answers:

Option (a) is “it is formed of capillary walls that are composed of tight junctions.” Blood–brain barriers are composed of epithelial cells, which create tight junctions between the cells. These tight junctions form the selective barrier of the blood–brain barrier system...

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