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Human Physiology, 7/e
Stuart I Fox, Pierce College
The Digestive System

Critical Thinking Exercises

Please answer all questions



1

An infant's stomach has a pH of around 5. How active would pepsin be in an infant's stomach?
2

Infants (stomach pH 5) and young children produce the enzyme rennin which denatures milk protein. What would you hypothesize about the optimal pH for rennin?
3

Other than the usual surgical risks involved in operating on an organ related to the digestive system, why should a healthy human appendix not be removed?
4

Sometimes penicillin tablets are formulated to contain a minimum daily requirement of vitamin K. Why?
5

The polypeptide hormone insulin is injected into diabetic patients. Why is it useless for the patient to take the drug orally?








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