ANATOMY & PHYSIOLOGY 4/E PAC 1 SEMESTER
4th Edition
ISBN: 9781265061173
Author: McKinley
Publisher: MCG CUSTOM
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Textbook Question
Chapter 26.4, Problem 26WDYL
How are proteolytic enzymes activated in the stomach and in the small intestine? Explain why this is necessary.
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Why are protein-digesting enzymes secreted as zymogens? Cite at least 3 references.
6. More enzyme activity....
A) Discuss how proteolytic cleavage is used to achieve tight control of the activity of digestive enzymes.
B) If proteolytic cleavage leads to irreversible activation of digestive enzymes, how is the activity of digestive
enzymes reduced when no longer needed? There were two ways presented this semester.
C) We looked at three serine protease enzymes: elastase, chymotrypsin, and trypsin. All three enzymes cut
peptide bonds using a similar catalytic mechanism. Explain why these are called serine proteases.
D) What are the different substrate specificities of elastase, trypsin, and chymotrypsin? And, why, from a
structural standpoint, do elastase, trypsin, and chymotrypsin have different substrate specificities?
Why do protease-supplying cells of the stomachand of the pancreas make onlyprecursors of the activeproteolytic enzymes?
Chapter 26 Solutions
ANATOMY & PHYSIOLOGY 4/E PAC 1 SEMESTER
Ch. 26.1 - How is the gastrointestinal (GI) tract...Ch. 26.1 - Prob. 2WDYLCh. 26.1 - What specific layer(s) must substances cross to...Ch. 26.1 - Prob. 4WDYLCh. 26.1 - Prob. 5WDYLCh. 26.1 - Prob. 6WDYLCh. 26.1 - Prob. 7WDYLCh. 26.1 - Prob. 8WDYLCh. 26.1 - Prob. 9WDYLCh. 26.2 - What structures are considered part of the upper...
Ch. 26.2 - Prob. 11WDYLCh. 26.2 - Prob. 12WDYLCh. 26.2 - How is the bolus moved from the oral cavity into...Ch. 26.2 - Prob. 14WDYLCh. 26.2 - Prob. 15WDYLCh. 26.3 - What organs are considered part of the lower GI...Ch. 26.3 - What are the three anatomic structures that...Ch. 26.3 - Prob. 18WDYLCh. 26.3 - Diagram the ducts of the accessory digestive...Ch. 26.3 - Prob. 20WDYLCh. 26.3 - Prob. 21WDYLCh. 26.3 - Prob. 22WDYLCh. 26.3 - Prob. 23WDYLCh. 26.3 - Which substances are typically absorbed by the...Ch. 26.4 - What enzymes are required to completely break down...Ch. 26.4 - How are proteolytic enzymes activated in the...Ch. 26.4 - What is the function of bile salts in lipid...Ch. 26.4 - Prob. 28WDYLCh. 26.4 - Prob. 29WDYLCh. 26.4 - Prob. 30WDYLCh. 26 - _____ 1. Which organ is located in the right upper...Ch. 26 - _____ 2. The _____ cells of the stomach are...Ch. 26 - _____ 3. Which of the following is an unregulated...Ch. 26 - _____ 4. Which organ (or part of an organ) is...Ch. 26 - _____ 5. Pancreatic juice contains a. HCO3 and...Ch. 26 - _____ 6. Bile is transported through the a....Ch. 26 - _____ 7. Digestion of proteins begins in the a....Ch. 26 - Prob. 8DYKBCh. 26 - _____ 9. Digestive enzymes that chemically digest...Ch. 26 - _____ 10. Most of the absorption of our digested...Ch. 26 - The GI tract from the esophagus to the anal canal...Ch. 26 - Discuss the reason why the involuntary sequence of...Ch. 26 - Prob. 13DYKBCh. 26 - Compare the structure of the circular folds,...Ch. 26 - Discuss why the tunica mucosa in the colon has a...Ch. 26 - Prob. 16DYKBCh. 26 - What is the role of the gallbladder in digestion?Ch. 26 - Describe the different forms of mechanical...Ch. 26 - Prob. 19DYKBCh. 26 - How are lipids absorbed in the GI tract?Ch. 26 - Prob. 1CALCh. 26 - Prob. 2CALCh. 26 - What component of the digestive tract can you not...Ch. 26 - The pancreatic ducts are blocked with a thick,...Ch. 26 - Prob. 5CALCh. 26 - Alexandra experienced vomiting and diarrhea and...Ch. 26 - A key event in the chemical digestion processes...Ch. 26 - Most cases of colorectal cancer occur in the most...
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