FUNCTION OF PLASMA MEMBRANE (ACTIVE TRANSPORT,PASSIVE TRANSPORT)

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FUNCTIONS OF PLASMA MEMBRANE

PART-1

1.The most important function of plasma membrane is transport of different substances into and out of the cell.

 

        Some types of transport:-

I) Passive transport- This type of transport do not require energy. It is 3 types:-

  a) Simple diffusion- Net movement of particles (Ions/Molecules) from any of their higher concentration towards an area of lower concentration that is along the concentration gradient.  

              Example- Movement of fats, oxygen, carbon dioxide and water to the Lipid portion of the membrane.

b) Osmosis- It is a diffusion of solvent molecules across a semipermeable membrane.

              Example- Movement of water into and out of the cell membrane.

c) Facilitated diffusion-Transport of particles is facilitated by some carrier protein e.g., permeases or translocases. Carrier protein bind to the substances with stereochemical specificity so highly selective.

            Example-Entry of glucose into RBC by D-hexose permease , entry of water through aquaporins in plasma membrane of cell.

II) Active transport-This type of transport require ATP. Movement of a particle against the concentration gradient by some carrier protein.

             Example- movement of most ions and amino acids by Na+-K+ ATPase , calcium ATPase, Proton pump.

III) Bulk transport- this type of transport figure ATP. It occurs with the help of vesicles. It is of three types- 

a) Exocytosis-secretion or ejection of particles from form a cell, particles being enclosed in a vesicle which fuses with the plasma membrane and release the content outside the cell.

                Example-secretions of neurotransmitter, hormones, mucus etc , ejection of cell waste.

REMAINING PART TOMORROW..... THANK YOU FOR READING.

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