What is endoplasmic reticulum PPT?
What is endoplasmic reticulum PPT?
These are single membrane cell organelles. These form an interconnected network of tubules, vesicles and cisternae with in cells. ER are considered as one of the components of cytoskeleton along with microtubules,microfilaments and intermediate filaments.
Who discovered ER first?
ER discovered by Emilio Veratti in the year of 1902 as Sarcoplasmic Reticulum in muscle fibers which is similar to ER in other cells (Veratti, 1961). Fifty years later, this new organelle was first visualized through electron microscopy (EM) by Keith Porter and termed it as “endoplasmic reticulum” (Porter, 1953).
What is ER and its 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 the structure of ER?
The endoplasmic reticulum is the largest single structure in eukaryotic cells. It consists of a range of interconnected shapes, including sheets and tubules, and comprises a lumen enclosed by a membrane that is continuous with the membrane that surrounds the nucleus of the cell (Figure 1).
What are the 3 main functions of the endoplasmic reticulum?
The endoplasmic reticulum (ER) serves important functions particularly in the synthesis, folding, modification, and transport of proteins.
What are the types of ER?
There are two types of endoplasmic reticulum: rough endoplasmic reticulum (rough ER) and smooth endoplasmic reticulum (smooth ER). Both types are present in plant and animal cells. The two types of ER often appear as if separate, but they are sub-compartments of the same organelle.
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).
What is endoplasmic reticulum made of?
The endoplasmic reticulum (ER) is composed of a membrane-bound and interconnected network of flattened tubular structures. They are present in the cytoplasm of eukaryotic cells. ER with ribosomes on the surface are known as rough endoplasmic reticulum and are involved in the protein synthesis.
What are two types of endoplasmic reticulum?
Under the electron microscope, it is possible to distinguish two types of endoplasmic reticulum: rough and smooth.
Where is endoplasmic reticulum located?
cytoplasm
The endoplasmic reticulum (ER) is a network of membrane-enclosed tubules and sacs (cisternae) that extends from the nuclear membrane throughout the cytoplasm (Figure 9.1). The entire endoplasmic reticulum is enclosed by a continuous membrane and is the largest organelle of most eukaryotic cells.
How many types of ER are there?
two
The ER can be classified in two functionally distinct forms: the smooth endoplasmic reticulum (SER) and the rough endoplasmic reticulum (RER).
What is endoplasmic reticulum best described as?
Endoplasmic reticulum is a network of membranes inside a cell through which proteins and other molecules move. Proteins are assembled at organelles called ribosomes. When proteins are destined to be part of the cell membrane or exported from the cell, the ribosomes assembling them attach to the endoplasmic reticulum, giving it a rough appearance.
What are diseases caused by endoplasmic reticulum?
Summary.
What are analogies for endoplasmic reticulum?
What Is an Analogy for Smooth Endoplasmic Reticulum? An analogy for smooth endoplasmic reticulum are the halls of a factory through which information passes. The information in the case of a cell is messenger RNA. A cell is analogous to a factory.
What is endoplastic reticulum?
The endoplasmic reticulum ( ER) is a network of flattened sacs and branching tubules that extends throughout the cytoplasm in plant and animal cells. These sacs and tubules are all interconnected by a single continuous membrane so that the organelle has only one large, highly convoluted and complexly arranged lumen (internal space).
