When histamine is released during immediate hypersensitivity, what property does it have that causes anaphylaxis?

Acquired oral melanin pigmented lesions may be associated with which of the following?

a. Aspirin abuse b. Penicillin ingestion c. Chronic infection by C. albicans d. Xerostomia e. None of the above

Which aspect of a dental treatment would make a patient vulnerable to syncope?

a. The patient must lean their head back. b. The patient must remain stationary in the dental chair. c. The patient must leave their mouth wide-open. d. The patient may have difficulty swallowing during a dental procedure.