BIOL273 Chapter Notes - Chapter 6: Extracellular Fluid, Mitochondrial Replacement Therapy, Cell Adhesion Molecule
24 Nov 2016
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Biol 273 chapter 6: communication, integration and homeostasis notes. Electrical signals: changes in a cell"s membrane potential. Chemical signals: molecules secreted by cells into the extracellular fluid. Local communication: gap junctions: which allow direct cytoplasmic transfer of electrical and, contact-dependent signals: which occur when surface molecules on one chemical signals between adjacent cells. Forms from the union of membrane-spanning proteins cell membrane bind to surface molecules on another cell"s membrane: chemicals that diffuse through the extracellular fluid to act on cells close by. Long-distance communication: uses a combination of chemical and electrical signals carried by nerve cells and chemical signals transported in the blood. Occurs in the immune system ad during growth and development. Cams: act as receptors in cell-to-cell signaling. Linked to the cytoskeleton or to intracellular enzymes. Paracrine signal: (para-, beside + krinen, to secrete) is a chemical that acts in cells in the immediate vicinity of the cell that secreted the signal.
