In an allergic reaction, the chemicals that are responsible for dilating blood vessels, increasing mucous secretion, and swelling of tissues are
A) histamines.
B) antigens.
C) antibodies.
D) hormones.
Question 2
Which of the following is NOT a method of HIV transmission?
A) Sharing contaminated needles
B) Exchange of body fluids
C) Mother-to-child
D) Using a contaminated toilet seat