KIN 2500 Chapter : Chapter 2 Notes
15 Mar 2019
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Introduction: cells are the basic, living, structural and functional units of the body, cell biology or cytology, cells perform chemical reactions to create life processes, compartmentalization, the specialization of a chemical process within a certain cell (within organelles) A generalized cell: three principle parts: plasma membrane, cytoplasm, nucleus, **picture of cell on powerpoint** Functions of cells: covering, ex: skin, epithelial cells. Storage: ex: adipose cells (fat cell, defense, ex: lymph nodes, connection, ex: collagen fibers, communication, ex: neurons, reproduction, ex: sperm cells, etc. Flexible yet sturdy barrier: separates internal and external environment of cell. Fluid mosaic model: the arrangement of molecules within the membrane resembles a sea of lipids containing many types of proteins. Lipids act as a barrier to certain substances: proteins act as "gatekeepers" to certain molecules and ions, consists of a lipid bilayer. Integral proteins-glycoproteins: glycoprotein: carbohydrate attached to a protein, protrudes into extracellular fluid, glycolipid, glyocalyx.
