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1. In the mouth and stomach,salivary -amylase initiatesthe digestion of which nutrients?
A. Proteins
B. Carbohydrates
C. Fats
D. Fiber:
Answer B
Salivary -amylase is an enzyme that initiates only carbohydrate digestion in the mouth and
stomach.
2. Which elements in saliva protect against tooth decay?
A. Salivary -amylase and ptyalin
B. Secretin and IgA
C. Endogenous enamelin and salivary -amylase
D. Exogenous fluoride and a pH of 7.4:
Answer D
The bicarbonate concentration of saliva sustains a pH of approximately 7.4, which
neutralizes bacterial acids and prevents tooth decay. Exogenous fluoride (e.g., fluoride in
drinking water) is absorbed and then secreted in the saliva, providing additional protection
against tooth decay.
3. Saliva contains which immunoglobulin (Ig)?
A. IgA
B. IgE
C. IgG
D. IgM:
Answer A
Saliva contains only IgA, which helps prevent infection.
4. What effect is a result of inhibiting the parasympathetic nervous system with a drug
such as
NSG 5003 Chapter 40 Structure and Function of the Digestive System (Complete And Study material) 13pages LEARNEXAMS
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