题目内容

All of the following are part of the first line of defense against invaders except

A. tears
B. saliva
C. neutrophils
D. skin

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Damaged cells release a vasodilator substance called

A. interleukin
B. interferon
C. histamine
D. complement

Which of the following cells mature in the thymus?

A. T cell
B cell
C. plasma cell
D. natural killer cell

Sensitivity to animal-derived immune serum may lead to a serious condition called

A. serum sickness
B. hay fever
C. Kaposi sarcoma
D. rejection syndrome

An abnormal reactivity to one’s own tissues is called

A. allergy
B. autoimmunity
C. anaphylaxis
D. rejection