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 D
Explanation
A. stomach: the stomach is an organ of the alimentary canal (not an accessory organ).
B. pharynx: the pharynx is part of the alimentary canal (passageway), not an accessory organ.
C. esophagus: the esophagus is part of the alimentary canal (conduit), not accessory.
D. pancreas: the pancreas is an accessory organ (secretes digestive enzymes and bicarbonate into the duodenum).
Correct Answer is A
Explanation
A. Altered oxygen-carrying capability of blood: RBCs (via hemoglobin) are the primary carriers of oxygen; too few (anemia) or dysfunctional RBCs reduce O₂ delivery, too many (polycythemia) can alter flow.
B. Altered ability to clot blood: clotting is primarily mediated by platelets and clotting factors, not by RBC count (RBCs can influence viscosity but are not the main clotting elements).
C. Altered ability to fight infection: fighting infection is mainly the role of leukocytes (WBCs), not RBCs.
D. Altered heart rate and contractility: significant changes in RBC number (especially anemia) can cause compensatory increases in heart rate and contractility to maintain oxygen delivery; polycythemia can also change cardiac workload.
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