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.
It is composed of seminal fluid from the seminal vesicles, fluid from the prostate, fluid from the Cowper's gland, and sperm. Sperm move from the testicles to the seminal vesicles through tubes called the vas deferens. In the seminal vesicles, they mix with other fluids to form semen.