ppt

2. cell to cell communication

3. Contents
• What is cell
• Exocytosis
• Endocytosis
• Receptor mediated endocytosis
• Cell junction
• Three stages of communications
• Examples of communications

4. What is cell ?
Cell is the basic unit of life consisted
of nucleus ,cytoplasm and organelles ,all of which
Surrounded by cell membrane

5. Exocytosis
In which material are exported out of
the cell via secretary vesicles .

6. Endocytosis
• Cell membrane help to take in materials by in
folding in the form of vacuole. This type of
intake is called endocytosis.

7. Protein destined for the cell
membrane
• Exocytosis used to integrate new proteins into
cell membrane . In which new protein is formed
inside the cell and migrate to phospholipid
bilayer of vesicles .
• The vesicles containing new protein as part of
phospholipid bilayer ,fuse with cell membrane
This allow the protein to be integrated into cell
membrane where vesicles ,in the same way as
with waste protein ,fuse and open with cell
membrane

8. Two Types Of Endocytosis
• Phagocytosis
• Pinocytosis

9. Phagocytosis
• The Large solid particles are taken in the cell
then the process is called phagocytosis

10. Pinocytosis
• The liquid particles are taken in the cell then
the process is called pinocytosis

11. Receptor mediated endocytosis
There are receptor embedded in cell membrane,
when bound by molecule with exact match in
shape,size,or physical attribute allow the
molecule to enter in cell through the same
engulfment process as phagocytosis or
pinocytosis

12. Cell junction
• It consist of three types
• Gap junction
• Tight junction
• Desmosomes

13. Tight Junction
• The Plasma membrane of neighboring cells
are very tightly pressed against each other,
bound together by specific protein.
• Forming continuous seals around the cells,
tight junction prevent leakage of extracellular
fluid across a layer of epithelial cells .

14. Gap junction
• This is called communicating junction .
• It provide cytoplasmic channels from one cell
to an adjacent cell and in this way are similar
in their function to the plasmodesmata in
plants .
• Gap junction consist of membrane protein
that surround a pore through which ions,
sugar and other molecule pass.

15. DESMOSOMES
• This is called “Anchoring Junction”.
• Function is fastening cells together into strong
sheets.
• Desmosomes attach muscles cells to each
other in a muscle. Some “muscle tear "involve
the rupture of desmosomes.

16. Three Stages Of Cell Communication
• Reception
• Transduction
• Response

17. Different examples of cell
communication
• Diabetic patient
• Entrance of pathogen
• Transplant organs