ATI RN
PAL Histology Lymphatic System Lab Practical Question 1 Questions
Question 1 of 5
Vibrations from the sound waves are amplified by
Correct Answer: C
Rationale: The stirrup (stapes) in the middle ear amplifies sound vibrations, while the eardrum transmits and the anvil (incus) transfers them, but amplification is primarily by the stapes.
Question 2 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 3 of 5
A cytokine that induces multiple effects on different immune cells is said to be.
Correct Answer: A
Rationale: Pleiotropic cytokines (e.g., IL-6) have multiple effects on various cells, unlike autocrine (self-acting), synergistic, or antagonistic.
Question 4 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 5 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.