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

The order of successive steps in digestion is:

a. absorption follows enzymatic hydrolysis.

b. secretion of enzymes follows absorption of digestive material.

c. mechanical processing follows enzyme secretion.

d. mechanical processing follows enzymatic hydrolysis.

e. enzymatic hydrolysis precedes secretion of digestive aids.

Summary Introduction


Most invertebrates and all vertebrates show extracellular digestive system. This system of digestion works in five steps in the following order: mechanical processing, secretion of enzymes and other digestive aids, enzymatic hydrolysis, absorption of digestive material, and finally elimination of undigested material.


The justification for the correct answer:

Option (a) states that the absorption follows enzymatic hydrolysis. This is a true statement. The food that is broken down into simpler molecules due to enzymatic action during the enzymatic hydrolysis leads to the absorption of molecular subunits from the digestive material into the body fluids and cells. Hence, option (a) is correct.

The justification for the incorrect answers:

Option (b) states that the secretion of enzymes follows the absorption of digestive materials. This is an incorrect statement as secretion of enzymes follows the mechanical process and is preceded by enzymatic hydrolysis. So, it is an incorrect option.

Option (c) says that mechanical processing follows enzyme secretion...

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