What is lysosomes class 9

The basic structure of cell consist of nucleus, plasma membrane and cytoplasm. Other than this different structures like Endoplasmic Reticulum(ER), Golgi body, Lysosomes, Mitochondria, Plastids and Vacuoles are also present. All of these are cell organelles. Presence of different cell organelles differ from organism to organism i.e. unicellular or multicellular organism. Cell organelle can be either membrane bound or can lack membrane. Cell Organelles Endoplasmic Reticulum(ER): It is divided into Rough Endoplasmic Reticulum (RER) and Smooth Endoplasmic Reticulum (SER). Collectively, this cell organelle, appears as network of tubules and flattened sac like structures. Rough endoplasmic reticulum appears like flattened sac and has rough outer surface, as outer surface contains ribosomes on it. Ribosomes are sites for manufacture and transport of proteins. Smooth endoplasmic reticulum appears like tubules and manufacture lipids. They also remove harmful drugs and poisons from the cell. Proteins and lipids formed at endoplasmic reticulum is used in construction of plasma membranes. This process is known as membrane biogenesis. . Golgi body / Golgi apparatus: Golgi apparatus appears as flattened sac like structure arranged parallely one above the other called as cisterns. Cisterns are membrane bound vesicles that keeps material inside the apparatus separated from outside cytoplasm. This cell organelle package and process material i.e. proteins and lipids in and out of cell. Gol...

Table of Contents: • • • • • : Cell Structure: Lysosomes. Biology4Kids.com! This tutorial introduces lysosomes. Other sections include plants, animal systems, invertebrates, vertebrates, and microorganisms. Here’s something scientists are still trying to figure out. If the lysosome holds many types of enzymes, how can the lysosome survive? Lysosomes are designed to break down complex molecules and pieces of the cell. Why don’t the enzymes break down the membrane that surrounds the lysosome? Video advice: Lysosomes: Definition, Structure and Functions B.Sc. II year Why Don’t They Digest the Cell?– A lysosome is basically a specialized vesicle that holds a variety of enzymes. The enzyme proteins are first created in the rough endoplasmic reticulum. Those proteins are packaged in a vesicle and sent to the Golgi apparatus. The Golgi then does its final work to create the digestive enzymes and pinches off a small, very specific vesicle. That vesicle is a lysosome. From there the lysosomes float in the cytoplasm until they are needed. Lysosomes are single-membrane organelles. Lysosomes are small, membrane-bound sacks of acidic enzymes that digest cell waste. They maintain an interior acidity by using proton pumps from chemical reactions on their surface and in their interior. Lysosomes work by absorbing small pieces of cell debris and surrounding larger fragments. The Structure of Lysosomes– They are located in the cytosol of the cells, floating freely within the cells outside t...

• Lysosomes are membrane bound sacs filled with digestive enzymes . • Lysosomes are responsible for keeping the cell clean of any foreign materials or old, out-of-function organelles . • They maintain this function with the help of enzymes capable of digesting all organic material. • The enzymes are made by RER . • These are also known as the “suicidal bags” of the cell.