In this diagram of a negative feedback system, what
labeled box represents a receptor?
a. A
b. B
c. C
d. A and C
e. All of these
Answer: a
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External chemical signals that coordinate potential reproductive partners are called _____
A) hormones B) pheromones C) paracrine signals D) cytokines E) gametes
Antigen bearing particles in the blood travel to the ____, while those in solid tissues travel to the ____
a. spleen; bone marrow b. thymus; bone marrow c. spleen; lymph nodes d. lymph nodes; spleen e. bone marrow; thymus
What secretes cytokines that enhance the activity of B cells, cytotoxic T cells, suppressor T cells, and helper T cells?
A) macrophages B) suppressor T cells C) helper T cells D) B cells E) cytotoxic T cells
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