During the inflammatory response, dilation of blood vessels is caused by nitric oxide. histamine. cytokines. phagocytes. both histamine and nitric oxide.

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true or false The main role of neuroimmune cell units at barrier surfaces is barrier protection .

True/False: Unlike innate immune responses, adaptive immune responses are initiated in secondary lymphoid organs. However, the innate immune response to an infection in a tissue has a pivotal role in inducing T-cell responses in the nearest lymph node by activating tissue dendritic cells and inducing their migration to the lymph node.

True/False: The C3 convertase amplifies the process of complement activation by generating large amounts of C3b and cleaving large numbers of C5 molecules.