Different body cells can respond differently to the same peptide hormones because
A)different target cells have different sets of genes. B)each cell converts that hormone to a different metabolite. C)a target cell's response is determined by the components of its signal transduction pathways. D)the circulatory system regulates responses to hormones by routing the hormones to specific targets. E)the hormone is chemically altered in different ways as it travels through the circulatory system.
Testosterone is an example of a chemical signal that affects the very cells that synthesize it,the neighbouring cells in the testis,along with distant cells outside the gonads.Thus,testosterone is an example of
A)an autocrine signal. B)a paracrine signal. C)an endocrine signal. D)both an autocrine signal and a paracrine signal. E)an autocrine signal, a paracrine signal, and an endocrine signal.