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there are several definitions associated with cell transport definition

Dec 25, 2015

     there are several definitions associated with cell transport definition:

     cell transport definition:The transport is mainly the material exchange between the cells and the environment, including the absorption of nutrients, the elimination of the raw materials and the elimination of metabolic wastes and the secretion of the products. Such as the absorption of glucose from the blood glucose and plasma membrane on the ion pump will pump K+, the Na+ pump into the cell is a kind of transport.

OKorder there are several definitions associated with cell transport definition

     cell transport definition---Active transport

     By passive transport of absorbing material, the cells need to consume energy, and need to be on both sides of the membrane. Under normal circumstances, the concentration of many mineral elements in the soil solution is always lower than the concentration of the cell.Sodium ion, potassium ion, calcium ion, can not freely through the phospholipid bilayer, they are transported from the low concentration to the high side of the side, the need to support the carrier protein, but also need to consume the energy released by the chemical reaction of the cells, which is called active transport.

     cell transport definition---Passive transport

     Some large molecules, such as glucose, are not free to pass through the cell membrane. Some special proteins on the cell membrane can help glucose and other materials to transport a concentration gradient across the membrane. The substance of the cell is spread by the aid of the carrier protein, which is called to assist in the diffusion, and assists in the diffusion of proteins, but does not require energy. Free diffusion and diffusion are collectively referred to as passive transport.

     cell transport definition---Cell swallow

     When the cellular uptake of macromolecules, large molecules attached to the surface of cell membrane, the membrane invagination formation of vesicles surrounded by large molecules. Then from the cell membrane vesicles separated into vesicles inside the cell, this phenomenon is called endocytosis.

     The cell requires a large molecule, which is formed in the cells of the vesicles, vesicles moved to the cell membrane, and cell membrane fusion, the large molecules discharge cells, this phenomenon is called the exocytosis.

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