Question

which is derived from arachidonic acid and mediates allergic and inflammatory responses?
platelet factors
leukotrienes
nitric oxide
thromboxane

Explanation:

To solve this, we analyze each option:

• Platelet factors: Involved in coagulation, not derived from arachidonic acid for allergic/inflammatory responses.
• Leukotrienes: Derived from arachidonic acid (via the 5 - lipoxygenase pathway) and mediate allergic and inflammatory responses.
• Nitric oxide: A gaseous signaling molecule, not derived from arachidonic acid for these responses.
• Thromboxane: Derived from arachidonic acid but mainly involved in platelet aggregation and vasoconstriction, not allergic/inflammatory responses.

Answer:

B. Leukotrienes