01:119:116 Lecture Notes - Lecture 13: Signal Transduction, Duodenum, Adrenocorticotropic Hormone
Document Summary
Coordination of endocrine and nervous systems found in a wide range of animals: ex. of moths (invertebrates) Ex. molting larva grows in stages and must periodically molt sheds old exoskeleton and secretes new one endocrine pathway that controls molting begins in larval brain. 2 main secretions in the brain: production of ptth (neurohormone) Ptth signals prothoracic gland to produce ecdysteroid that. Controls successive molt by bursts production-> each triggers a molt. Also controls metamorphosis change in form closer to adult: production of juvenile hormone (jh) Secreted by corpora allata (pair of endocrine glands) Jh to low adult emerges from pupa= metamorphosis: practical application. Synthetic jh used as insecticide prevents insects from maturing into reproducing adults. Our focus: the following glands and hormonal regulation of growth. Hypothalamus, pituitary gland, thyroid gland, parathyroid glands, adrenal glands: hypothalamus, key regulatory structure. Directly or indirectly controls most hormone activity. Part of brain composed of neuroendocrine tissue produces neurohormones.