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Immune system of the body - class-IX

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Mast cells secrete.

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A
All the above
💡 Explanation:
  • Mast cells are found in mucous membranes and connective tissues and are important for wound healing and defense against pathogens via the inflammatory response.
  • The mast cell granules are composed of serotonin, heparin, and histamine. They secrete serotonin, heparin, and histamine when they are activated in the presence of the toxic substance or a pathogen.
  • Hence Mast cells secrete 'serotonin, heparin, and histamine'.
  • So, the correct answer is 'All the above'.
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