BISC 101 Lecture Notes - Lecture 18: Posterior Pituitary, Anterior Pituitary, Thyroid
Document Summary
Bisc 101 lecture 18 hormones and the endocrine system. Peptides or short chains of amino acids and proteins or long chains of amino acids. Epinephrine has many effects in mediating the body"s response to short. Epinephrine binds to receptors on the plasma membrane of liver cells. This triggers the release of secondary messenger molecules that activate enzymes and result in the release of glucose into the bloodstream: norepinephrine or noradrenaline, adh, ot, trh, pth, gh, acth, insulin, glucagon. Hormone pathways: hormones are released from an endocrine cell, hormones travel through the blood stream, hormones interact with the receptor or a target cell to cause a physiological response. Negative feedback loop: inhibits a response by reducing the initial stimulus. Negative feedback regulates man hormonal pathways involved in homeostasis. Insulin and glucagon control the levels of blood glucose. Insulin and glucagon are antagonistic hormones that help maintain glucose homeostasis.