What occurs during the antigen detection stage of the antibody-mediated immune response initiated by T cell activation?
a. Cytotoxic T cells destroy body cells that are infected with a pathogen.
b. Helper T cells activate an antigen-specific B cell to divide and secrete antibodies.
c. A T cell displaying an antigen-specific T cell receptor (TCR) binds to the antigen on the surface of an antigen
presenting cell.
d. Helper T cells are activated by the TCR.
e. A B cell degrades the pathogen and produces antigens.
c
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A friend asks you how exocrine glands differ from endocrine glands. She knows that both form from invaginated epithelium. How do you respond?
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A typical human yawn lasts for about six seconds and once initiated, is nearly impossible to stop. Although there are many hypotheses for why we yawn, it is accepted that yawning is contagious - when we see someone else yawn, we often find ourselves yawning as well. This happens across all cultures and even in infants! In this case, the yawn an individual observes is ________, while their own yawn is ________.
A. a sign stimulus; a fixed action pattern B. reflex response; learned behavior C. an association; a conditioned response D. innate behavior; habituation