Chapter 2 BASIC FUNCT IONS OF THE CELL 8 1. The cell membrane its transport ● Fluid mosaic model e Transport across cell membrane 米 Simple diffusion *k Facilitated diffusion *k Active transport k Secondary active transport k Exocytosis endocytosis
Chapter 2 § 1. The cell membrane & its transport • Fluid mosaic model • Transport across cell membrane * Simple diffusion * Facilitated diffusion * Active transport * Secondary active transport * Exocytosis & endocytosis BASIC FUNCTIONS OF THE CELL
k Simple diffusion its energy source O, CO,. NH. NO. etc k Facilitated diffusion its characteristics Facilitated diffusion via ion channel Chemically gated channel Voltage-gated channel Mechanically gated channel Nat. K+ Ca2+ Cl- channel Facilitated diffusion via carrier Glucose amino acids. some ions. etc
* Simple diffusion & its energy source O2 , CO2 , NH3 , NO, etc. * Facilitated diffusion & its characteristics Facilitated diffusion via ion channel Chemically gated channel Voltage-gated channel Mechanically gated channel Na+ , K+ , Ca2+, Cl− channel Facilitated diffusion via carrier Glucose, amino acids, some ions, etc
k Active transport Sodium-potassium pump its effects Other pumps: calcium pump, proton pump k Secondary active transport Membrane protein: pump+transporter Forms: symport antiport ck Exocytosis endocytosis Exocytosis: cell secretion Endocytosis: phagocytosis Receptor mediated endocytosis
* Active transport Sodium-potassium pump & its effects Other pumps: calcium pump, proton pump * Secondary active transport Membrane protein: pump+transporter Forms: symport & antiport * Exocytosis & endocytosis Exocytosis: cell secretion Endocytosis: phagocytosis Receptor mediated endocytosis