ATI RN
Questions on the Immune System Questions
Question 1 of 5
control lymph flow in one direction through Capillary
Correct Answer: D
Rationale: Bicuspid valves in lymphatic vessels ensure unidirectional lymph flow; tricuspid, aortic, and pulmonary valves are in the heart.
Question 2 of 5
in thoracic Cavity behind sternum:
Correct Answer: B
Rationale: Thymus is located in the thoracic cavity behind the sternum.
Question 3 of 5
which of the following is not a function of the spleen?
Correct Answer: D
Rationale: Spleen destroys RBCs , stores blood/platelets , forms fetal blood ; lymph filtration is a lymph node function .
Question 4 of 5
What happens to CD4-CD8 double-positive cells in the thymus when they do not recognize MHC molecules?
Correct Answer: D
Rationale: Double-positive thymocytes that fail to recognize MHC undergo apoptosis during negative selection; they don't proliferate or differentiate (B, C) without MHC interaction.
Question 5 of 5
What is the function of MHC I molecules?
Correct Answer: C
Rationale: MHC I presents endogenous (intracellular) peptides to CD8+ killer T cells ; exogenous peptides and Th cells are MHC II roles.