Final answer:
In an anaphylactic reaction, tryptase is released by both basophils and mast cells. Mast cell degranulation plays a crucial role in Type I hypersensitivity reactions, in contrast to cell lysis in Type II hypersensitivities.
Step-by-step explanation:
During an anaphylactic reaction, tryptase is released by basophils and mast cells.
When considering hypersensitivity reactions, it is important to note that different types invoke different responses within the immune system. Type I hypersensitivities involve the degranulation of mast cells upon subsequent exposure to an allergen, resulting in the release of mediators like histamine and tryptase. In contrast, Type II hypersensitivities are characterized by cell lysis (cytotoxicity) due to strong antibody reactions against cell surface antigens.