What is ultrastructure of endoplasmic reticulum?
The ER consists of the nuclear envelope and the peripheral ER, which includes smooth tubules and rough sheets. While the ER is defined as an interconnected network with a continuous membrane, the different structures that make up the ER perform very diverse and specialized functions within the cell.
What is endoplasmic reticulum Slideshare?
The entire endoplasmic reticulum is enclosed by a continuous membrane and is the largest organelle of most eukaryotic cells. Its membrane may account for about half of all cell membranes, and the space enclosed by the ER (the lumen or cisternal space) may represent about 10% of the total cell volume.
What are the structures of endoplasmic reticulum?
The general structure of the endoplasmic reticulum is a network of membranes called cisternae. These sac-like structures are held together by the cytoskeleton. The phospholipid membrane encloses the cisternal space (or lumen), which is continuous with the perinuclear space but separate from the cytosol.
What is endoplasmic reticulum structure and function?
The endoplasmic reticulum (ER) is a large, dynamic structure that serves many roles in the cell including calcium storage, protein synthesis and lipid metabolism. The diverse functions of the ER are performed by distinct domains; consisting of tubules, sheets and the nuclear envelope.
What is lysosome with diagram?
Lysosome Structure Lysosomes are membrane-bound organelles and the area within the membrane is called the lumen, which contains the hydrolytic enzymes and other cellular debris. The diagram below shows the lysosome structure within a cell. The pH level of the lumen lies between 4.5 and 5.0, which makes it quite acidic.
Why is it called endoplasmic reticulum?
Porter distinguished the exoplasm, a peripheral region devoid of organelles, from the adjacent endoplasm. In the endoplasm he detected a fine network of interconnected tubules, a reticulum; hence, the name “endoplasmic reticulum” (ER).
Is the structure of the endoplasmic reticulum uniform throughout the cell?
Structure of the Endoplasmic Reticulum This unique structure ensures that the endoplasmic reticulum can perform its important roles within the cell.
How does the structure of smooth er relate to its function?
The smooth endoplasmic reticulum comprises tube-like structure located near the cell periphery. These tubules or tubes sometimes branch forming a network that is reticular in appearance. The network of smooth endoplasmic reticulum allows for an increased surface area to be devoted to storage of key enzymes.
What structure represents the endoplasmic reticulum ER of the cell?
The endoplasmic reticulum (ER) is a continuous membrane system that forms a series of flattened sacs within the cytoplasm of eukaryotic cells. All eukaryotic cells contain an ER.
What are the 5 functions of endoplasmic reticulum?
What is the functions of Endoplasmic reticulum? ( 5 POINTS )
- Smooth ER is responsible for the synthesis of essential lipids such as phospholipids and cholesterol.
- Smooth ER is also responsible for the production and secretion of steroid hormones.
- It is also responsible for the metabolism of carbohydrates.