Nursing practice questions with comprehensive rationales
NurseDive Free Nursing Practice Question
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.
A. IgD
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
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: IgE is involved in allergy and parasitic defense and is not the primary protective antibody in breast milk or mucosal secretions.
D. IgM
IgM: IgM is the first antibody produced in primary responses and is mainly intravascular; it is not the dominant secretory antibody passed in milk.
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Full Explanation
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.
Similar Questions
What is the target of cytotoxic T cells?
A. Antigens in solution
Antigens in solution: cytotoxic T cells (CD8⁺) recognize antigen presented on MHC I of cells, not free/soluble antigens in plasma.
B. Cancer cells and virally infected cells
Cancer cells and virally infected cells: cytotoxic T cells detect abnormal peptides on MHC I and kill virally infected or neoplastically transformed (cancer) host cells.
C. Antigen-presenting cells
Antigen-presenting cells: Partially misleading -professional APCs present antigen on MHC II to helper T cells; cytotoxic T cells usually target infected or abnormal host cells (though APCs can present antigen on MHC I and theoretically be targeted).
D. Helper T cells
Helper T cells: helper T cells (CD4⁺) are immune coordinators, not the usual targets of cytotoxic T cells.
Full Explanation
A. Antigens in solution: cytotoxic T cells (CD8⁺) recognize antigen presented on MHC I of cells, not free/soluble antigens in plasma.
B. Cancer cells and virally infected cells: cytotoxic T cells detect abnormal peptides on MHC I and kill virally infected or neoplastically transformed (cancer) host cells.
C. Antigen-presenting cells: Partially misleading -professional APCs present antigen on MHC II to helper T cells; cytotoxic T cells usually target infected or abnormal host cells (though APCs can present antigen on MHC I and theoretically be targeted).
D. Helper T cells: helper T cells (CD4⁺) are immune coordinators, not the usual targets of cytotoxic T cells.
Which layer of the digestive tract is composed of epithelial tissue and may contain folds and mucus-secreting glands?
A. Submucosa
Submucosa: submucosa is connective tissue containing blood/lymph vessels and glands, not the epithelial lining.
B. Muscularis
Muscularis: muscularis is smooth muscle (inner circular/outer longitudinal layers) responsible for peristalsis, not epithelial.
C. Mucosa
Mucosa: the mucosa includes the epithelial lining, lamina propria, and may contain folds and mucus-secreting glands (e.g., gastric mucosa).
D. Serosa
Serosa: serosa is the outermost connective tissue/mesothelial covering of the gut, not the epithelial absorptive/secreting layer.
Full Explanation
A. Submucosa: submucosa is connective tissue containing blood/lymph vessels and glands, not the epithelial lining.
B. Muscularis: muscularis is smooth muscle (inner circular/outer longitudinal layers) responsible for peristalsis, not epithelial.
C. Mucosa: the mucosa includes the epithelial lining, lamina propria, and may contain folds and mucus-secreting glands (e.g., gastric mucosa).
D. Serosa: serosa is the outermost connective tissue/mesothelial covering of the gut, not the epithelial absorptive/secreting layer.
What is true for all of the enzymes that digest protein?
A. They are secreted in an inactive form.
They are secreted in an inactive form: major proteases of the GI tract (pepsinogen, trypsinogen, chymotrypsinogen, etc.) are secreted as zymogens (inactive precursors) to prevent autodigestion.
B. They are activated by HCI.
They are activated by HCl: pepsinogen is activated by HCl, but pancreatic proteases are activated by trypsin, not HCl, so this is not true for all protein-digesting enzymes.
C. They are secreted by the pancreas.
They are secreted by the pancreas: many proteases (e.g., pepsin) are secreted by the stomach, so not all are pancreatic.
D. Their release is stimulated by enterokinase.
Their release is stimulated by enterokinase: enterokinase (enteropeptidase) activates trypsinogen to trypsin in the small intestine but does not stimulate the release of all proteases; it is an activator, not a universal release stimulus.
Full Explanation
A. They are secreted in an inactive form: major proteases of the GI tract (pepsinogen, trypsinogen, chymotrypsinogen, etc.) are secreted as zymogens (inactive precursors) to prevent autodigestion.
B. They are activated by HCl: pepsinogen is activated by HCl, but pancreatic proteases are activated by trypsin, not HCl, so this is not true for all protein-digesting enzymes.
C. They are secreted by the pancreas: many proteases (e.g., pepsin) are secreted by the stomach, so not all are pancreatic.
D. Their release is stimulated by enterokinase: enterokinase (enteropeptidase) activates trypsinogen to trypsin in the small intestine but does not stimulate the release of all proteases; it is an activator, not a universal release stimulus.