ATI RN
Lymphatic System Questions and Answers PDF Questions
Question 1 of 5
is lined by endothelium, macrophage.
Correct Answer: D
Rationale: All lymphatic sinuses (trabecular, medullary, subcapsular) are lined by endothelium and macrophages.
Question 2 of 5
Regarding the lymphatic capillaries, choose the correct statement:
Correct Answer: A
Rationale: Lymphatic capillaries are made of a single endothelial layer ; they are more permeable, lack tight junctions, and have no pericytes.
Question 3 of 5
Emil von Behring developed the 'serum therapy', a treatment that offered protection against diphtheria. The basis for this therapy was the immunization of horses with diphtheria toxin, after which the serum of the horses was taken and used to treat diphtheria-infected individuals. Paul Ehrlich postulated that side-chains were responsible for this effect. What did those side-chains turn out to be?
Correct Answer: B
Rationale: Serum therapy relies on antibodies produced in horses that bind and neutralize diphtheria toxin; complement and phagocytes play roles in immunity but aren't the primary 'side-chains' Ehrlich identified.
Question 4 of 5
What is the role of IFN-γ in activating macrophages?
Correct Answer: B
Rationale: IFN-γ activates macrophages by signaling invader presence ; it enhances killing (A indirectly), doesn't directly increase lysosomes , and TNF production is a result.
Question 5 of 5
What is the problem with the short cytoplasmic tails of TCRs?
Correct Answer: B
Rationale: Short TCR tails can't signal activation ; CD3 compensates; antigen recognition and co-receptor binding are intact.