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Mast cells of connective tissue contain

1. vasopressin and relaxin
2. heparin and histamine
3. heparin and calcitonin
4. serotonin and melanin

Correct answer: heparin and histamine

Solution

Mast cells in connective tissue store preformed mediators in their granules, especially histamine and heparin. These substances are released during allergic and inflammatory responses.

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