Cell Membrane Transport Fill In Notes Plasma Membrane • Functions: – Helps cells maintain balance (_________________) – Holds contents of the cell in place – Takes food and __________ (glucose, amino acids, and lipids) – _________________ Permeable • Plasma membrane allows ___________ molecules to pass in while keeping others out • Water: in and out ________ • Name something in everyday life that controls what/who can go in or out Organization of Plasma Membrane • Cholesterol: – _______________ phospholipids by preventing fatty acid tails from sticking together Plasma membrane are made up of ______________ that are filled with variety of pores, molecules, and channels Receptor Proteins: Trigger a set of cell ___________ when specific molecules bind to cell. Recognition Proteins __________ and cell surface _ ________________ sites Decides: “belongs” or “doesn’t belong” How does your wifi decide who “belongs”? Enzymatic Proteins ________________ chemical reactions on membrane ___________ Transport Proteins Allows needed ___________ substances or waste materials to cross membrane CELLULAR TRANSPORT: OSMOSIS • Concentration ________________, areas of high and low concentrations • Salt, sugar, etc. too large to pass through a membrane • Diffusion: Movement from___________________concentration Passive Transport • Simple __________ with concentration gradient • Requires _____________ • FACILITATED DIFFUSION: – Transport proteins ________ substances move through plasma membrane • Channel proteins • Diffusion = ________________ Active Transport • • • ____________ concentration gradient – From lower concentration to higher __________________ Sodium-Potassium Pump: – transports ______________of the cell and potassium into the cell ________ their concentration gradients. – Carrier proteins used in _________ transport to pick up ions or molecules near cell membrane and carry them across membrane releasing them on other side. Transport of large particles • Endocytosis: Cell surrounds and takes in material from environment – Material __________ pass directly through membrane – Is ___________ and enclosed by portion of cell’s plasma membrane – Portion of membrane breaks away, leaving vesicle with contents which moves into cell Ingest Food (Take In) • __________________ Ingest liquid • ___________________ – Exocytosis: Release of Wastes, Secretions • Exocytosis: Expulsion/Release of _______ materials from cell – Used to ___________ wastes – Also used to secrete _____________ produced by cell Let’s Break It Down…
