can you tell me more about this last mentioned cells.
It is a migrant cell of connective tissue that contains many granules rich in histamine and heparin.
Mast cell
A mast cell (also known as a mastocyte or a labrocyte) is a migrant cell of connective tissue that contains many granules rich in histamine and heparin. 
true or false anaphylaxis generally only affects the skin and eyes Incorrect. why does this happen? Common causes include insect bites and stings, foods, and medications. Other causes include latex exposure and exercise. how does the latter effect? Through their direct effects on mast cells.
wiki:11704737
Mast cell [SEP] Introduction
A mast cell (also known as a mastocyte or a labrocyte) is a migrant cell of connective tissue that contains many granules rich in histamine and heparin. Specifically, it is a type of granulocyte derived from the myeloid stem cell that is a part of the immune and neuroimmune systems. Mast cells were discovered by Paul Ehrlich in 1877. Although best known for their role in allergy and anaphylaxis, mast cells play an important protective role as well, being intimately involved in wound healing, angiogenesis, immune tolerance, defense against pathogens, and vascular permeability in brain tumours. The mast cell is very similar in both appearance and function to the basophil, another type of white blood cell.