Chemical Messengers 3. Hormones â¢Longârange messengersâ¢Secreted into blood by endocrine glands in response to appropriate signalâ¢Exert effect on target cells some distance away from release site 4.hemical Messengers 3. Hormones â¢Longârange messengersâ¢Secreted into blood by endocrine glands in response to appropriate signalâ¢Exert effect on target cells some distance away from release site 4.
Scale box in millimeters. Vesicular texture is a volcanic rock texture characterized by a rock being pitted with many cavities (known as vesicles) at its surface and inside.
Vermiculite. Vermiculite is produced by heating mica, a common soil mineral, to 1,800 degrees Fahrenheit, causing it to puff up to many times its original size. Similar to peat moss, it helps the medium hold large quantities of air, water and nutrients relative to its small size.eat moss refers to organic matter harvested from bogs in many northern regions of the world. For horticultural use, it's usually run through a mill to chop it up into a uniform size. It is dark brown in color and has a spongy texture, capable of holding a lot of water for its volume.