Published: Sun, November 05, 2017
World | By Tasha Manning

From the drawers of my desk: May 2012

From the drawers of my desk: May 2012

In the animal eucalyptus cell, the plasma membrane, also called the cytoplasmic membrane and the cell membrane, is an active molecular conglomerate. This conglomerate forms a continuous layer that covers the surface of the cell, so it is responsible for controlling the exchanges of matter and energy that occur to and from the interior of the cell. This membrane has as its main mission to keep the intracellular environment stable by regulating the passage of water, elements and molecules.

Types of substance exchange

Concentrations of Solute on both sides of the membrane are regulated by osmotic pressure. Water enters and leaves the cell to maintain stable concentrations, as the water tends to flow towards the area where its concentration is lower. The plasma membrane allows this flow by its permeability to water. Passive or simple diffusion

It is the transport of substances that occur in favor of a concentration gradient. This means that if the concentration of the exterior is greater than inside the cell, the substance will be incorporated or moved into the cell. Substances that are capable of being exchanged in this way are gases and small molecules apolar. In this type of transport of substances there is no energy expenditure. As in passive diffusion, the movement of the substance occurs in favor of the concentration gradient, but it needs the help of membrane proteins that act as transport molecules, thus causing an expense Of energy. These carrier molecules have a structure complementary to the molecule to be transported.

Active transport and passive transport

It is the passage of substances through the plasma membrane with the help of proteins that act as transporter molecules. This type of transport requires a lot of energy consumption, which is produced by the hydrolysis of a molecule of ATP (adenosine triphosphate). Energy consumption is due to the transport of substances against the concentration gradient. The substances that cross the membrane by active transport are: Na, K, glucose and amino acids.

Although not explained in this article, it should be noted that there are two types of active transport: coupled Na pump and electrogenic Na pump.

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It is capturing and transporting inland Of the cell of extracellular substances by invaginations of the cellular membrane. It is the form that the cell uses to feed itself. There are three types of endocytosis:

~ phagocytosis - ingests large solid particles such as macromolecules and viruses

~ pinocytosis - ingests liquids and dissolved substances

~ endocytosis By means of a receptor - is the type of endo- cytocytes in which the substance enters the cell through a specific receptor for that substance Elimination of waste by exocytosis < Is the transport of substances towards the outside of the cell, by the fusion of the vesicle that contains them with the plasma membrane.

The purpose of exocytosis is:

~ excision - eliminates toxic and waste products from the cell

~ secresion - eliminates substances made by the cell to benefit other cells < P>

These are the transport processes that are performed through the plasma membrane in order to maintain a stable environment in the cell and therefore a good condition of the body in general.

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