Exam 28: Immunity and Host Defense

In adaptive immunity, pathogen specific receptors are produced in large numbers only after exposure to the pathogen or its products.

What is the difference and similarity between a B cell and a T cell?

Antihistamines are used to treat some allergic symptoms because they neutralize the histamine mediators that cause rapid dilation of blood vessels and contraction of smooth muscles that initiate the symptoms of systemic anaphylaxis.

In allergic encephalitis TH1- mediated delayed- type hypersensitivity can cause_________ directed against self- antigens.

Individuals with high antibody titers are said to be _________.

Systemic lupus erythematosus (SLE) is an example of a disease caused by type _________hypersensitivity.

A toxoid is an attenuated form of a toxin that retains both its antigenicity and toxicity.

Antibodies are soluble proteins produced by T cells.

The T cell, with its T cell receptor, can recognize antigens only when the antigens are complexed with self proteins known as major histocompatibility complex found on host cell surfaces.