Once a helper T-lymphocyte recognizes an antigen, it begins the immune response by secreting chemical signals called

A.  antibodies.
B.  immunoglobulins.
C.  memory B-lymphocytes.
D.  memory T-lymphocytes.
E.  cytokines.


E

Anatomy & Physiology

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The hormone __________ is secreted by the adrenal cortex and causes the kidneys to retain sodium.

Fill in the blank(s) with the appropriate word(s).

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Anatomy & Physiology