Anatomy and Cell Biology 3309 Lecture Notes - Lecture 3: Heterochromatin, Desmosome, Cell Cortex
16 Sep 2016
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Document Summary
Cell is made up of membranes that make compartmentalized spaces. Can be seen through light and electron microscopy. Integral proteins = docking devices that span the lipid bilayer. Pumps: transport ions, aa"s, sugars actively across membranes. Channels: allow small molecules to cross the cell membrane. Receptors: recognize and bind specific effector molecules initiating a response. Linkers: anchor the intracellular cytoskeleton to the extracellular matric. Structural proteins: often link cells to one another, concentrated in specific regions. Pinocytosis: invagination of fluid and small molecules into the cell. Receptor-mediated endocytosis: invagination of large substances into the cell. Coated vesicles forms (electron dense materials on outside of the vesicle). Constitutive secretion: things delivered to the cell surface. Material packaged in vesicles travelling to membrane dumps the contents on the membrane of the vesicle into the cell membrane itself. Regulated secretion: requires signals from receptors on plasma membrane that receives signals and induces the vesicles to deliver things to the outside environment i. e. hormones.
