Step 1 : Introduction to the question "mammalian steroid hormones are signaling molecules that function in which of the following types of cell signaling?"
...Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct. The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands.
