Newborns can be protected against certain digestive and respiratory infections when they receive what via their mother's milk? This antibody is also present in secretions like tears and nasal fluid.
IgD
IgA
IgE
IgM
The Correct Answer is B
A. IgD: IgD is mainly a B-cell receptor on naïve B cells and is not the dominant secretory antibody in mucosal secretions or breast milk.
B. IgA: Secretory IgA is abundant in breast milk (colostrum) and mucosal secretions (tears, saliva, nasal fluid) and helps protect infants’ mucosal surfaces from pathogens.
C. IgE: IgE is involved in allergy and parasitic defense and is not the primary protective antibody in breast milk or mucosal secretions.
D. IgM: IgM is the first antibody produced in primary responses and is mainly intravascular; it is not the dominant secretory antibody passed in milk.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["B","C"]
Explanation
A. They are thicker than arteries: veins generally have thinner walls (especially a thinner tunica media) than arteries because they carry blood at lower pressure.
B. Their tunica media is less developed than in arteries: veins have a thinner tunica media (less smooth muscle and elastic tissue) compared with arteries.
C. They often have one-way valves: many veins (especially in the limbs) have valves to prevent backflow and assist venous return against gravity.
D. They carry blood under very high pressure: veins return blood under low pressure; arteries carry blood under much higher pressure.
Correct Answer is C
Explanation
A. Pepsin: pepsin is a stomach protease that digests proteins, not starch.
B. Mucus: mucus lubricates and protects tissues but does not chemically digest starch.
C. Salivary amylase: salivary amylase (ptyalin) begins starch digestion in the mouth, producing maltose/oligosaccharides that taste sweet.
D. Bicarbonate ions: bicarbonate neutralizes acid but does not break down starch.
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