ATI RN
PAL Histology Lymphatic System Lab Practical Question 1 Questions
Question 1 of 5
monocyte in while macrophage in
Correct Answer: B
Rationale: Monocytes are in blood, while macrophages are in connective tissue (C.T.).
Question 2 of 5
Which complement protein forms a complex that functions as a chain saw to slice other C3 proteins?
Correct Answer: B
Rationale: C3bBb (convertase) cleaves C3 into C3a and C3b ; C1 initiates classical, C3 is cleaved, C4 is upstream.
Question 3 of 5
What is the function of CD4 and CD8 co-receptors?
Correct Answer: C
Rationale: CD4/CD8 enhance TCR signaling via CD3 ; they stabilize MHC binding (A indirectly), not antigen binding .
Question 4 of 5
Which cells in the thymus examine T cells for MHC restriction and tolerance of self during positive selection?
Correct Answer: C
Rationale: Cortical thymic epithelial cells test T cells for MHC restriction in positive selection ; medullary cells handle negative selection.
Question 5 of 5
Which type of immunoglobulin molecule is passed on to nursing infants in breast milk?
Correct Answer: C
Rationale: IgA is in breast milk for infant gut immunity; IgG crosses the placenta, IgM and IgE don't transfer via milk.