Lymphocytes secrete a protein which causes th | vedclass

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(D) The correct answer is $D$. Lymphocytes are a type of white blood cell involved in the immune response. Histamine is a chemical mediator released p

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None of the above

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(D) The correct answer is $D$. Lymphocytes are a type of white blood cell involved in the immune response. Histamine is a chemical mediator released primarily by mast cells and basophils, not lymphocytes, which causes vasodilation (dilation of blood vessels) and increases capillary permeability during inflammatory responses. Pyrogens are substances that induce fever. Interferons are proteins secreted by virus-infected cells to protect non-infected cells. Since none of the options correctly identify a protein secreted by lymphocytes that causes vasodilation, the correct choice is $None 	ext{ of the above}$.

Lymphocytes secrete a protein which causes the dilation of blood vessels. The protein is

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