Which cell type, found in connective tissue proper and close to blood vessels, secretes heparin and histamine?

The question lacks options, the options are:

a) Mast cell

b) Fibroblast

c) Adipocyte

d) Plasma cell

e) Mesenchymal cell

The correct answer is a) Mast cell

Explanation:

Mast cells are essential regulatory cells in the modulation of inflammatory and allergic processes. These connective tissue migrant cells have abundant heparin (blood regulator) and neutral proteases in their granules, produce large amounts of histamine (which functions as a neurotransmitter and plays a fundamental role in allergic reactions and the immune system). Mast cells are found in the skin, intestinal submucosa and usually, close to small blood vessels and lymph vesicles.

littering streams           is the answer