Explanation

Plasma cells of connective tissue produce antibodies. Mast cells are modified basophil cells of blood and present in connective tissue. These cells secrete histamine (vasodilator), serotonin (vasoconstrictor), heparin (anticoagulant). White and yellow fibres are present in matrix of connective tissue. White fibres are present in matrix of connective tissue. White fibres are made up of collagen protein and yellow fibres are made up of elastin protein.