Platelets are cell fragments that are released by what type of cell?
Megakaryocytes
Macrophages
Monoblasts
Reticulocytes
The Correct Answer is A
A. Megakaryocytes: Megakaryocytes are large bone marrow cells whose cytoplasmic fragments become platelets (thrombocytes).
B. Macrophages: Phagocytic cells derived from monocytes; they do not produce platelets.
C. Monoblasts: Immature precursors that develop into monocytes/macrophages, not platelets.
D. Reticulocytes: Immature red blood cells (RBC precursors) released from bone marrow—not a source of platelets.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
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.
Correct Answer is {"dropdown-group-1":"C"}
Explanation
Correct answer: Right atrium
The arrow indicates the right atrium— the chamber that receives systemic venous return via the superior and inferior venae cavae.
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