Once a helper T-lymphocyte recognizes an antigen, it begins the immune response by secreting chemical signals called
A. antibodies.
B. memory T-lymphocytes.
C. memory B-lymphocytes.
D. immunoglobulins.
E. cytokines.
Answer: E
Anatomy & Physiology
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Anatomy & Physiology
Which of the following connective tissue layers is outside all the others?
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Anatomy & Physiology
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Anatomy & Physiology
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Anatomy & Physiology