ATI RN
PAL Histology Lymphatic System Lab Practical Question 1 Questions
Question 1 of 5
Which of the following compounds is produced and secreted by mast cells during an allergic reaction?
Correct Answer: C
Rationale: Mast cells release histamine in allergic reactions, causing symptoms like swelling, not interferon, allergens (triggers), or perforin.
Question 2 of 5
The predominant antibody isotype in external secretions that can neutralise pathogens and toxins and prevent their interaction with mucosal surfaces is
Correct Answer: A
Rationale: IgA dominates in secretions (e.g., saliva, mucus), neutralizing pathogens at mucosal surfaces.
Question 3 of 5
The major role of helping B cells to produce antibodies of high affinity by the dual ability of secreting either Th1 or Th2 cytokines is characteristic of which type of T cell
Correct Answer: A
Rationale: T follicular helper (TFH) cells aid B cells in germinal centers, secreting Th1/Th2 cytokines for affinity maturation.
Question 4 of 5
The immunoglobulin Joining chain (J-chain) is
Correct Answer: C
Rationale: J-chain links IgM and IgA multimers ; not T-cells , neutrophils , or IgE .
Question 5 of 5
A living microbe with reduced virulence that is used for vaccination is considered:
Correct Answer: D
Rationale: Attenuated microbes are live, weakened for vaccines; toxoids are inactivated toxins.