human physiology

                                  Transport Across the Membrane                                                                            Membrane Transport                                                      ...

                                            2. Cell membrane Proteins          Embedded in the fluid lipid bilayer Types : Peripheral & integral or transmembrane proteins     1. Peripheral proteins  : ·          Loosely bound to the membrane ·          Non-covalently bound to integral proteins ·          Provides structural integrity to the cell membrane        T ypes                               1. Intrinsic - anchored to cytoskeleton o...

                                   1.Cell Membrane - Structure   Features: Plasma membrane is a dynamic structure and its constituents are constantly renewed. The thickness of membrane is about 7.5 nm Semipermeable - allowing some substances to pass through while excluding others Components :                       Phospholipids                      Cholesterol                 40%                        ...

  WATER REABSORPTION Amount of filtrate formed = 125 ml/minute or 180 lt/day Amount of filtrate reabsorbed = 124 ml / minute or 178.5 lt/day Amount of fluid excreted in urine = 1.5 lt /day Reabsorption at PCT (65% of filtered fluid)       Mechanism : Pumping of sodium out of tubular epithelial cells by Na + -K + ATPase pump                                           ↓                           Passive diffusion of Na + along with other solutes                              ...