False statement about macrophages -
Type III hypersensitivity occurs when there is an excess of antigen, leading to small immune complexes being formed that fix complement and are not cleared from the circulation. Large complexes can be cleared by macrophages but macrophages have difficulty in the disposal of small immune complexes.
Can harbor mycobacteria
Derived from blood monocytes
Involved in type III hypersensitivity reactions
Produce tumor necrosis factor and interleukins