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Mdlo1
  óu
P rte A
 a
A la 1
 u




          Mmr n
            e b aa
          P am t a
           l s á ic
Mmr n s
        e b aa
Classificam-se as membranas de
  acordo com sua permeabilidade:
• Permeável: permite passagem de
  soluto e solvente;
• Impermeável: não permite
  passagem de solvente nem do
  soluto;
• Semipermeável: permite a
  passagem do solvente, mas não
  do soluto;
• Seletivamente permeável:
  permite passagem do solvente e
  de alguns tipos de soluto.
M m r n P am t a
  e b a a l s•Camada
               á ic
                        bimolecular de
                             lipídios
                            •Porção
                          hidrofóbica
                         voltada para
                             dentro
                            •Porção
                           hidrofílica
                       voltada para fora
Modelo: M
       fluido
             osaico-    •Moléculas de
Singer e N icholson,
        1972
                           proteínas
M m r n P am t a
 e b a a l s á ic
      •Delgada
 •Semipermeável
   •Lipoproteica
Modificações d M m r n
              a e b aa
       Pl s á ic
         am t a
                                      MICROVILOSIDADES
                                  •São projeções da membrana
                                  com forma de dedos de luvas
                                 que aumentam a superfície de
                                             contato.




           D s os os
            e m som
 •São projeções da membrana
  (placas arredondadas) que
tem a finalidade de aumentar a
     ligação entre as células
Modificações d M m r n
                a e b aa
         Pl s á ic
           am t a

       In gin ção
         va a                            Zon s d o lusão
                                            a e c
•Reentrâncias profundas da        •É uma estrutura de vedação e
 membrana no citoplasma.          adesão que impede o trânsito
                                    de substâncias por entre as
                                             células.




                      In e digita s
                        tr        çõe
                 •Conjunto de saliências e
                reentrâncias na membrana
                  que tem a finalidade de
                aumentar a ligação entre as
                           células.

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Aula 2 membrana plasmática

  • 1. Mdlo1 óu P rte A a A la 1 u Mmr n e b aa P am t a l s á ic
  • 2. Mmr n s e b aa Classificam-se as membranas de acordo com sua permeabilidade: • Permeável: permite passagem de soluto e solvente; • Impermeável: não permite passagem de solvente nem do soluto; • Semipermeável: permite a passagem do solvente, mas não do soluto; • Seletivamente permeável: permite passagem do solvente e de alguns tipos de soluto.
  • 3. M m r n P am t a e b a a l s•Camada á ic bimolecular de lipídios •Porção hidrofóbica voltada para dentro •Porção hidrofílica voltada para fora Modelo: M fluido osaico- •Moléculas de Singer e N icholson, 1972 proteínas
  • 4. M m r n P am t a e b a a l s á ic •Delgada •Semipermeável •Lipoproteica
  • 5. Modificações d M m r n a e b aa Pl s á ic am t a MICROVILOSIDADES •São projeções da membrana com forma de dedos de luvas que aumentam a superfície de contato. D s os os e m som •São projeções da membrana (placas arredondadas) que tem a finalidade de aumentar a ligação entre as células
  • 6. Modificações d M m r n a e b aa Pl s á ic am t a In gin ção va a Zon s d o lusão a e c •Reentrâncias profundas da •É uma estrutura de vedação e membrana no citoplasma. adesão que impede o trânsito de substâncias por entre as células. In e digita s tr çõe •Conjunto de saliências e reentrâncias na membrana que tem a finalidade de aumentar a ligação entre as células.