Final answer:
True, basophils can degranulate causing vasodilation after complement activation. They release histamines which lead to vasodilation and increased vascular permeability.
Step-by-step explanation:
The question 'After complement activation, do basophils degranulate causing vasodilation?' can be answered with 'True'. Basophils, upon activation by complement components such as C3a and C5a, can degranulate and release histamine and other inflammatory mediators. These mediators, especially histamine, lead to vasodilation and increased vascular permeability, which are hallmarks of the inflammatory response. This process is similar to that involving mast cells, which also degranulate to release histamine when activated, although mast cells and basophils develop from different precursor cells and are found in different locations within the body.