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.
The exception to this rule is the American pronghorn antelope; they shed their horn sheaths once each year (the pronghornâs bony horn cores are not shed). Washington state species that grow antlers each year include deer, elk, moose, and mountain caribou. Antlers form beneath a covering of living skin.