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.
Pompholyx of the palms. Acute episodes of vesicular eczema are characterized by a sudden onset of small, clear vesicles or bullae that are said to be sago grainâlike or tapiocalike in appearance (see the image above). Vesicles and/or bullae are accompanied by severe, occasionally painful pruritus.