CAS BI 106 Lecture Notes - Lecture 2: Lipid Droplet, Ground Substance, Centroacinar Cell
14 Feb 2017
School
Department
Course
Professor
Document Summary
How the actual 3d cells fit into the 2d view we get when looking through a microscope. Machine slices through the 3d object in very thin slices: longitudinal section, cross sections, oblique sections. Staining: different chemicals in dyes stick to different regions of the object and you get a different view. Expand surface area (usually for absorption: cilia. Highly motile extensions the apical plasma membrane and internal cytoskeleton for movement. Physical protection (protects everything inside your body) Selective permeability (only some things can get in (keeps water and most uv radiation out) Always associated with connective tissue on basal side. Thin lining of connective tissue on basal side: basement membrane. Prevent materials: tight junctions (think red rover) Impermeable junctions that prevent molecules from passing between two cells: desmosomes (think button snaps) Anchoring junctions that bind adjacent cells together: gap junctions (think gap as in there is a gap between cells)
