BIO210Y5 Chapter Notes - Chapter 16: Thyroid, Pituitary Gland, Adrenal Medulla
Document Summary
Module 16. 1: the nervous and endocrine system release chemical messengers that bind to target cells. Endocrine: hormone exchange between distant tissues and organs via the bloodstream. Both systems rely on the release of chemicals that bind to specific receptors on the target cell. Both systems have similar chemical messengers (norepinephrine and epinephrine are hormones that enter the bloodstream, but they are also neurotransmitters in synapses) Both systems work by a negative feedback control mechanism. Both systems have a common goal: to preserve homeostasis by coordinating and regulating the activities of other cells, tissues, organs, and systems. There are 4 mechanisms of intracellular communication: Direct communication: happens through gap junctions using ions, small solutes, and lipid soluble. Paracrine communication: happens through extracellular fluid using paracrine factors. Endocrine communication: happens through the bloodstream using hormones: synaptic communication: happens across synapses using neurotransmitters. Module 16. 2: hormones may be amino acid derivatives, peptides, or lipid derivatives.
