A hormone (from Greek á½ÏÎ¼Î®, impetus) is any member of a class of signaling molecules produced by glands in multicellular organisms that are transported by the circulatory system to target distant organs to regulate physiology and behaviour. Eicosanoids â hormones derive from lipids such as arachidonic acid, lipoxins and prostaglandins. 2  Steroid â Examples of steroid hormones include the sex hormones estradiol and testosterone as well as the stress hormone cortisol.
Rating Newest Oldest. Best Answer: Bull moose shed their antlers in late autumn or early winter, after the end of the breeding season. A new set begins to grow the following spring, nourished by the covering of furry skin known as velvet.
His antlers fall off when the breeding season is over, in early winter. Male elk begin to grow their antlers in the spring. They first appear as small bumps covered in fuzz. They grow from the same spot year after year, known as a pedicel. The grow longer over the summer and are covered in fuzzy velvet. Velvet is tissue rich in blood vessels, which nourishes the growing antlers.