Question

1. what chemical is released during inflammation by certain blood cells, which makes the capillaries dilate and become more permeable?

a. antigen
b. cytokine
c. histamine
d. perforin

Explanation:

During inflammation, certain blood cells release histamine. Histamine causes capillaries to dilate and become more permeable, allowing immune - cells and fluid to move into the affected area. Antigens are substances that trigger an immune response, cytokines are signaling molecules in the immune response, and perforin is involved in cell - mediated immunity for killing target cells.

Answer:

c. histamine