BIOL 1050 Chapter Notes - Chapter 48-49: Anterior Pituitary, Thyroid, Posterior Pituitary
Document Summary
Hormone = are secreted into the extracellular uid, circulate in the hemolymph or blood, and communicate regulatory messages throughout the body. Ecdysteroid (in caterpillars) = stimulates the growth of adult cells, the programmed death of larval cells and even the behaviours that bring about the motionless pupal stage. Each hormone has speci c receptors in the body. A hormone elicits a response such as a change in metabolism only from speci c target cells, those that have the matching receptor. Cells lacking a receptor for that particular hormone are unaffected. Endocrine system = chemical signalling by hormones. One of the two basic systems of communication and regulation throughout the body. Hormones secreted by endocrine cells regulate reproduction, development, energy metabolism, growth and behaviour. Nervous system = a network of specialized cells neurons that transmit signals along dedicate pathways. These signals regulate neurons, muscle cells and endocrine cells. Signalling by neurons can regulate the release of hormones as well.
