Exogenous antigens are:
A. Displayed on MHC II proteins
B. Displayed on MHC I proteins
C. Displayed on CD8 proteins
D. Displayed on CD4 proteins
Answer: A. Displayed on MHC II proteins
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The first heart sound is the closing of the:
a. pulmonary semilunar and aortic semilunar valves b. tricuspid and mitral valves c. mitral and bicuspid valves d. tricuspid and pulmonary semilunar valves
A muscle located on the anterior surface of the thigh will ________ the knee, whereas a muscle on the posterior surface will ________ the knee
A) flex, extend B) extend, flex C) adduct, abduct D) abduct, adduct
When is the generation of an action potential impossible, no matter the strength of the stimulus?
A) absolute refractory period B) threshold C) depolarization D) relative refractory period
Which cells are involved in humoral immunity?
A. Neutrophils B. Plasma cells C. Basophils D. Tcytotoxic cells