Differentiate between type I and type II cells of the lungs.
The type I cells secrete surfactant and the type II cells will give rise to bronchiolar smooth muscle cells.
The type I cells form alveolar walls and the type II cells secrete surfactant.
Both type I and type Il cells produce surfactant.
The type I cells produce cartilage for larger airways and the type II cells give rise to the ciliated cells lining the trachea.
The Correct Answer is B
A. The type I cells secrete surfactant and the type II cells will give rise to bronchiolar smooth muscle cells: type I cells do not secrete surfactant, and type II cells do not give rise to bronchiolar smooth muscle.
B. The type I cells form alveolar walls and the type II cells secrete surfactant: type I pneumocytes are thin squamous cells forming most of the alveolar surface for gas exchange; type II pneumocytes secrete surfactant and can proliferate/differentiate into type I cells.
C. Both type I and type II cells produce surfactant: only type II pneumocytes produce surfactant; type I do not.
D. The type I cells produce cartilage for larger airways and the type II cells give rise to the ciliated cells lining the trachea: neither pneumocyte type produces cartilage or airway ciliated cells; those are separate tissues/cell lineages.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. The type I cells secrete surfactant and the type II cells will give rise to bronchiolar smooth muscle cells: type I cells do not secrete surfactant, and type II cells do not give rise to bronchiolar smooth muscle.
B. The type I cells form alveolar walls and the type II cells secrete surfactant: type I pneumocytes are thin squamous cells forming most of the alveolar surface for gas exchange; type II pneumocytes secrete surfactant and can proliferate/differentiate into type I cells.
C. Both type I and type II cells produce surfactant: only type II pneumocytes produce surfactant; type I do not.
D. The type I cells produce cartilage for larger airways and the type II cells give rise to the ciliated cells lining the trachea: neither pneumocyte type produces cartilage or airway ciliated cells; those are separate tissues/cell lineages.
Correct Answer is B
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.
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