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.
In biology, a vesicle is a relatively small intracellular, membrane-enclosed sac that stores or transports substances. In geology, a vesicle is a void formed in solidified l â¦ ava due to the decrease in pressure at eruption which allows dissolved gasses to come out of solution.n geology, a vesicle is a void formed in solidified l â¦ ava due to the decrease in pressure at eruption which allows dissolved gasses to come out of solution.