Biology: The Dynamic Science (Mind...

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



Biology: The Dynamic Science (Mind...

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

A flexible, rubbery protein in connective tissue is called ___, whereas a more fibrous, less flexible glycoprotein is called ___.

a. adipose; cartilage

b. endocrine; exocrine

c. sweat; hormones

d. chondroitin sulfate; hydroxyapatite

e. elastin; collagen

Summary Introduction


Connective tissues are derived from the mesoderm and their major function is to provide structural support, transmission of mechanical and other forces, and can to act as filters. The body of an animal is composed of one or more kinds of connective tissues. The mechanical properties of connective tissues are dependent on the type of ECM (extra cellular matrix) it harbors, which can range from fluid (blood) to soft (tendon) to hard or crystalline (bones) in nature.


Explanation for the correct answer:

Option (e) is elastin and collagen. It is the correct answer because the primary component of ECM is a fibrous glycoprotein called collagen, which is not flexible in nature and is embedded into the network of proteoglycans. Also, in certain connective tissues, the ECM consists of a rubber like protein that provides elasticity and flexibility. Hence, option (e) is correct.

Explanation for incorrect answer:

Option (a) is adipose and cartilage. It is incorrect because adipose tissue is a connective tissue made up of adipocytes, whose function is to store and deposit fat molecules. Cartilage on the other hand is also a connective tissue that is soft and flexible in nature and is found in ears, nose, larynx and trachea. So, it is an incorrect option.

Option (b) is endocrine and exocrine. It is incorrect because these are basically glands, which can either secrete substances like hormones directly into the bloodstream (endocrine) or can release their secretions via a duct or canal to the target organ (exocrine)...

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