Which cells are responsible for releasing heparin and histamine during immune responses?

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Multiple Choice

Which cells are responsible for releasing heparin and histamine during immune responses?

Mast cells store histamine and heparin in their granules and release them when activated during immune responses. Located in connective tissue near blood vessels and mucosal surfaces, they respond quickly to threats such as pathogens or allergens. When mast cells degranulate, histamine increases blood vessel dilation and permeability, leading to redness, swelling, and easier movement of immune cells into the affected area. Heparin acts as an anticoagulant to help prevent clots at the site, aiding immune cell access. The other options aren’t fitting because capillaries are blood vessels, plasma cells produce antibodies, and macrophages focus on phagocytosis and cytokine signaling rather than releasing histamine and heparin.

Mast cells store histamine and heparin in their granules and release them when activated during immune responses. Located in connective tissue near blood vessels and mucosal surfaces, they respond quickly to threats such as pathogens or allergens. When mast cells degranulate, histamine increases blood vessel dilation and permeability, leading to redness, swelling, and easier movement of immune cells into the affected area. Heparin acts as an anticoagulant to help prevent clots at the site, aiding immune cell access. The other options aren’t fitting because capillaries are blood vessels, plasma cells produce antibodies, and macrophages focus on phagocytosis and cytokine signaling rather than releasing histamine and heparin.

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