Functions of lysosomes.pptx

lysosome

1. Functions of lysosomes Intracellular digestion Extra cellular digestion Autophagy Autolysis Heterophagy

2. Intracellular digestion The digestion which entirely takes place inside the cell. Intracellular digestion is  a form of digestion which takes place within the cytoplasm of the organism . Intracellular digestion takes place in animals without a digestive tract, in which food items are brought into the cell for digestion.

3. Extracellular digestion The digestion which takes place outside the cell. A sperms role is to deliver a male’s nucleus to egg. The sperm head contains a single and highly specialized lysosome called the acrosome . Acrosome release the enzymes ( Hyaluronidases ) that allows the sperms to fuse with egg. (Extracellular digestion) 1.Zona paluceda 2.Corona rediata

4. Autophagy Auto=self phagy=eating When lysosomes eat reserve food(stored ;protein or lipid)or faulty cellular organelle (mitochondria) it is called autophagy. Examples: Mitophagy: The removal of damaged mitochondria.

5. Autolysis The destruction of whole cell by its own enzyme,released by lysosomes. Examples: Autolysis occurs in ageing,or diseased cells. The disappearance of larval organs during metamorphosis ( e.g. tail in frog) is due to autolysis . actually cells of tail destroyed.

6. Heterophagy digestion of exterior material taken into a cell by phagocytosis.