Which of the following might occur after a helper T cell is presented with a processed antigen and costimulated?
A. Helper T cells destroy the presenting cell.
B. Helper T cells produce antibodies.
C. Helper T cells release interleukins that stimulate B cells to clone.
D. Helper T cells stop division.
E. Helper T cells lyse.
C
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A base is described as a proton donor.
Indicate whether this statement is true or false.
Food is prevented from entering the nasal cavity during swallowing by the ________.
A. soft palate B. tongue C. hard palate D. palatine tonsils E. epiglottis
Sound waves are converted into mechanical movements by the
A) auditory ossicles. B) cochlea. C) oval window. D) round window. E) tympanic membrane.
The membranes that line the tubes or cavities that have openings to the external environment are referred to as ________.
A. synovial membranes B. mucous membranes C. cutaneous membranes D. serous membranes