Final answer:
The main action of interferon is not to increase capillary permeability and vasodilation.
Step-by-step explanation:
False. The main action of interferon is not to increase capillary permeability and vasodilation. Interferons are proteins that are produced and released by host cells in response to viral infections.
They play a critical role in the immune response by alerting nearby cells to the presence of a viral infection and activating various antiviral defense mechanisms. Interferons primarily act to inhibit viral replication and spread, rather than affecting capillary permeability and vasodilation.