ATI RN
Questions on Immune System Questions
Question 1 of 5
When you cut yourself, the damaged cells immediately release chemical alarm signals, such as
Correct Answer: C
Rationale: Histamine is released by damaged cells (e.g., mast cells) to initiate inflammation, unlike interferon (antiviral), complement (immune enhancement), or antihistamine (blocks histamine).
Question 2 of 5
Complete the following sentence. The cleavage of C3 and C5 results in the production of C3a and C5a fragments which are...
Correct Answer: D
Rationale: C3a and C5a are anaphylatoxins that trigger inflammation by recruiting immune cells, not forming MAC (C5b-C9) or opsonizing (C3b role).
Question 3 of 5
Complete the following sentence. A genetic feature that contributes to the diversity of MHC molecules involves....
Correct Answer: A
Rationale: MHC diversity arises from codominant expression of alleles from both parental haplotypes, enhancing antigen presentation variety.
Question 4 of 5
T cells that express γ δ chains:
Correct Answer: A
Rationale: γδ T cells have innate-like roles, often lack CD4/CD8, and recognize non-MHC antigens.
Question 5 of 5
Isotypes refers to variations in the:
Correct Answer: A
Rationale: Isotypes (e.g., IgG, IgM) differ in heavy chain constant regions ; variable regions (B, D) determine specificity, not isotype.