BIOL-242 Lecture Notes - Lecture 1: Cell Adhesion Molecule, Endocrine System, Extracellular Fluid
13 Apr 2020
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Document Summary
The endocrine system is the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things. Communication occurs by electrical signals and chemical signals: electrical signals - changes in potential membrane (difference between internal and external part of cell, chemical signals - molecules secreted by cells into extracellular fluid. 1: nervous system fires action potentials release of neurotransmitters . Exert their effects at very low concentrations // from 10-9m (nanomolar) to. Hormones are very strong because they can fire at low concentrations. Amino acid-based hormones // made of one aa, two aa, peptides, proteins, made in many tissues all over the body. Steroids // synthesized from cholesterol, made only by gonads and adrenal glands in cortex. Have ducts to carry secretion to membrane surface. Pituitary, thyroid, parathyroid, adrenal, and pineal glands. Produces hormones but also digestive enzymes, eggs/sperm, nourishes embryo during pregnancy.
