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 average elk antlers have about 6 points per side. Some elk bucks grow antlers with up to 10 points on each side, weighing up to 40 lbs., and measuring up to 5 ft in length. This usually occurs when the buck is about 11 years old, and the antlers tend to get smaller after that. This remarkable amount of growth occurs within a period of two months. Elk antlers are composed of bone, not like horns of other animals which are largely made up of the protein keratin. Growing antlers are about 80% protein and 20% ash.