First-generation antihistamines are ________; therefore, they cross the blood–brain barrier and enter the CNS, causing sedation

Which of the following features increases the appeal of an infectious agent for use in terrorist attacks?

A) Instability B) High infectivity C) Low potency D) Low virulence

Nasopalatine artery is a branch of the __________________________ section.

Fill in the blank(s) with the appropriate word(s).