All of the following statements relating to endocrine signaling are correct EXCEPT: O a. All peptide hormones are stored in vesicles and are released via exocytosis, whereas steroid hormones are not. O b. All steroid hormones bring about changes in gene expression, whereas protein hormones may or may not affect gene expression. O c. Hormonal signals enter the bloodstream, so hormones influence all cells with which they come in contact. O d. Histamine can be considered to be a paracrine hormone. O e. A single endocrine gland can secrete multiple hormones.

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