Cytoplasmic Membrane Composition.

Cytoplasmic Membrane Composition.

1. constituted by

   • protein
     • are classified in
       • peripherals
         • they have the function of
           • communication
             • types of cellular communication
               • GAP
               • synaptic
               • paracrine and autocrine
               • endocrine
         • they are located in
           • on one side or the other of the lipid bilayer and are weakly attached to the polar heads of the lipids
       • integral
         • they have the function of
           • transport
             • kinds of transport
               • low molecular weight molecules
                 • It might be because
                   • Active transport
                     • sodium-potassium pump
                   • passive transport
                     • simple broadcast
                     • facilitated diffusion
               • high molecular weight molecules
                 • can be moved by
                   • endocytosis
                     • there are four types
                       • pinocytosis
                       • phagocytosis
                       • receptor-mediated endocytosis
                       • potocitosis
                   • exocitosis
                   • trancystosis
         • they are located in
           • intimately linked to lipids, they usually cross the lipid layer once or several times
   • carbohydrates
     • They may be
       • glycolipids
         • they work in the cell
           • protect the surface
           • cell recognition
           • confers viscosity
       • glycoproteins
   • lipids
     • its function is
       • membrane movement
       • modulate the activity of membrane proteins and segregate laterally
       • define the physical properties of the membranes
     • types
       • sterols
         • they consist of
           • a hydroxyl group or alcohol in carbon 3, has four carbon rings of sterols, and an aliphatic chain.
             • • function
                 • they contribute to the modulation of stiffness, fluidity and permeability of membranes
       • glycolipids
         • they consist of
           • a ceramide (sphingosine + fatty acid) and a short chain carbohydrate; they lack a phosphate group
       • phospholipids
         • Is made up of
           • alcohol molecule (glycerol or sphingosine), to which two fatty acids and a phosphate group bind.
         • They are
           • amphipathic molecules, have a very polar hydrophilic end (the head) and a non-polar hydrophobic end, consisting of two long fatty acid chains (the tail)
         • form
           • lipid bilayer
             • is
               • double layer of accommodated phospholipids
             • the movements that phospholipids can perform are
               • flexion
                 • consists in
                   • hydrophobic tails movement of phospholipids
               • flip- flop
                 • consists in
                   • it is the movement of the lipid molecule from one layer to the other with the help of enzymes called flipases
               • lateral diffusion or translation
                 • consists in
                   • inside the same layer the molescula spread to the sides
               • rotation
                 • consists in
                   • turns of the molecules around its axis

2. ·

   • is:
     • Structure that represents the boundary between the extracellular and intracellular media in the cell
   • Its function is the cell:
     • Control your chemical content.
     • transmit messages
     • Set your form. Isolate and protect.
     • Its function is the cell.

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