Review the animation and answer the questions that follow to test your understanding.

1			In IgE mediated hypersensitivity, all of the following are needed except
			A)	antigen presenting cell
			B)	B cell
			C)	IgE antibody
			D)	mast cell
			E)	neutrophil
2			IgE molecules attach to
			A)	mast cells via their variable region
			B)	mast cells by their constant region
			C)	T helper cells by their variable region
			D)	plasma cells by their constant region
3			Histamine released by mast cells leads to all of the following symptoms except
			A)	capillary dilation
			B)	airway constriction
			C)	high fever
			D)	mucus secretion
			E)	itching
4			For a hypersensitivity response to occur, two bound IgE molecules on a mast cell must react with a specific antigen.
			A)	True
			B)	False
5			Activated T helper cells produce cytokines, which stimulate B cells to proliferate and differentiate into plasma cells capable of producing IgE.
			A)	True
			B)	False