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Structure and function of Cell membrane system in Eukaryotic cells.

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Introduction

Structure and function of Cell membrane system in Eukaryotic cells All cells have a cell membrane, whether it is the membrane that surrounds the cell or the membrane that is found in the inside of the cells. The features that are in a Eukaryotic cell, for example an animal cell include, a Plasma membrane, Endoplasmic reticulum, Golgi body, Lysosome, Mitochondria, Nucleus, Vacuole, and Microtubules. In a plant cell it includes these same features, but also includes the following, a Cell wall, and Chloroplasts. All of these features found in an Eukaryotic cell are all surrounded by a cell membrane. Whether the membrane is at the surface of the cell or is in the cytoplasm, it has the same structure. The structure of the cell membrane is sometimes described as the 'Fluid -Mosaic' model. It is usually described as a Fluid mosaic model for two reasons. The first reason was because the cell membrane was once thought to be an even layer, spread over the outside and inside of the Phospholipids. It's now thought to be unevenly distributed more like a mosaic than a layer. ...read more.

Middle

At the same time there would be a movement of water molecules from A to B by diffusion because solution A has a higher concentration of solute molecules than solution B has. Eventually, the concentrations of water molecules and solute molecules in A would equal that in B. solute + solvent = solution. Active transport is the process when cells move molecules or ions against their concentration gradient. The cell membrane contains protein molecules, which pushes ions into the cell, there are different types for a particular ion. When the ions bump into the protein, the protein uses energy from ATP, to change shape and therefore pushes the ion into the cell. -It receives information from the outside of the cell; the information is transmitted along neurons. The cell surface membrane of a neuron contains proteins. These are like channels for particular ions, and are sensitive for potential difference. So when an action potential sweeps down the cell surface membrane of the neuron, the change in potential difference opens ion channels in the membrane. This causes some of the vesicles of acetylcholine fuses with the presyneuptic membrane. ...read more.

Conclusion

The different parts of the cell are therefore separated and isolated from one another, because of this different processes are able to take place. With a Mitochondria, there are two types of membranes present, an inner membrane and an outer membrane. The outer membrane has the same functions as most outer membranes have; it separates them from one another. Mitochondria have a highly folded membrane, to which it supports the proteins of the electron transport responsible for synthesising ATP, also because it increases the surface area. The Nucleus is surrounded by a Nuclear envelope, it is also made up of two membranes, these have may gaps in them called Nuclear pores. These are large enough to allow partially assembled ribosome's from the Nucleolus to pass through. Overall. All the other organelles present in Eukaryotic cells are all surrounded by a cell membrane. Cell membranes can either be found inside the cell or it can be found surrounded around the cell. They have a number of different functions whether controlling the passages substance into and out of the cell, receiving information of involved in the process of Photosynthesis. ...read more.

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