Testosterone is an example of a chemical signal that affects the very cells that synthesize it, the neighboring cells in the testis, along with distant cells outside the gonads. Thus, testosterone is an example of _____
I) an autocrine signal
II) a paracrine signal
III) an endocrine signal
A) only I and II
B) only II and III
C) only I and III
D) I, II, and III
Answer: D
Biology & Microbiology
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