Critical Thinking Activities - Chapter 18

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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