The principal mediator of an allergic reaction is:
a. Hymenoptera
b. Injected penicillin
c. Delayed hypersensitivity
d. Histamine
d
Rationale: a. Hymenoptera is a classification of insects that includes wasps and bees.
b. Injected penicillin is the most common cause of anaphylactic reactions.
c. Delayed hypersensitivity is a type of allergic reaction that results in skin rash.
d. Correct.
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Indicate whether the statement is true or false.
The long tube that carries food to the stomach is called the:
A) ascending colon B) descending colon C) jejunum D) esophagus