BIOL 031 Lecture Notes - Lecture 31: Caveolae, Phagosome, Resting Potential
13 Aug 2020
School
Department
Course
Professor
Document Summary
Phagocytosis: vesicles created by the cytoskeleton, cell engulfs bacterium or another particle into phagosome. Endocytosis: membrane surface indents and forms vesicle, active process that can be nonselective (pinocytosis) or highly selective, receptor-mediated endocytosis uses coated pits, clathrin most common protein coated pits, membrane recycling. Caveolae: indentations that can catch things near the membrane. Exocytosis: putting things out of the cell. Apical (mucosal) membrane: faces the lumen (ex: apical membrane faces into the lumen of kidney) Paracellular transport: through junctions between adjacent cells. Transcellular transport: through cells themselves, transcytosis with vesicular transport. Transcellular transport of glucose uses membrane proteins. Opposite charges attract; like charges repel each other. Separating positive charges from negative charges requires energy. The cell membrane enables separation of electrical charge in the body. Artificial cell explains the distribution of charges across a phospholipid bilayer. Movement of k+ ions out of the cell according to a chemical gradient. Negative ions cannot follow because the membrane is impermeable to anions.
