The amino acid-derived hormones are relatively small molecules derived from the amino acids tyrosine and tryptophan. ![]() ![]() As a result, they remain in circulation longer than peptide hormones.Ģ. Steroid hormones are insoluble in water transport proteins carry them in the blood. Other steroid hormones include aldosterone and cortisol, which are released by the adrenal glands along with some other types of androgens. These two hormones are released by the female and male reproductive organs, respectively. Examples of steroid hormones include estradiol, which is an estrogen, or female sex hormone, and testosterone, which is an androgen, or male sex hormone. The primary class of lipid hormones in humans is the steroid hormones. Most lipid hormones are derived from cholesterol, so they are structurally similar to it. There are three major types of hormones that are lipid hormones, amino acid-derived hormones, and peptide hormonesġ. One of the keys, distinguishing features of lipid-derived hormones is that they can diffuse across plasma membranes, whereas the amino acid-derived and peptide hormones cannot. ![]() Hormones can be divided into three classes based on their chemical structure: lipid-derived, amino acid-derived, and peptide hormones (which includes peptides and proteins).
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