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单词 Endoplasma
释义

Endoplasma

英语百科

Endoplasm

Shown is a micrograph of an amoeba; the darker pink nucleus is central to the eukaryotic cell, with the majority of the rest of the cell's body belonging to the endoplasm. Though not visible, the ectoplasm resides directly internal to the plasma membrane.
This is a perikaryon of a nerve cell, displayed here because of the obvious cytoplasmic granules. The granules, which appear almost black due to their high electron density, take up a large portion of the endoplasm. They are suspended in cytosol - the fluid component of the cytoplasm.
This image displays the 3 main processes of cell respiration - the pathway from which the cell obtains energy in the form of ATP. These processes include glycolysis, the citric acid cycle, and the electron transport chain.

Endoplasm generally refers to the inner (often granulated), dense part of a cell's cytoplasm. This is opposed to the ectoplasm which is the outer (non-granulated) layer of the cytoplasm, which is typically watery and immediately adjacent to the plasma membrane. These two terms are mainly used to describe the cytoplasm of the amoeba, a protozoan, eukaryotic cell. The nucleus is separated from the endoplasm by the nuclear envelope. The different makeups/viscosities of the endoplasm and ectoplasm contribute to the amoeba's locomotion through the formation of a pseudopod. However, other types of cells have cytoplasm divided into endo- and ectoplasm. The endoplasm, along with its granules, contains water, nucleic acids amino acids, carbohydrates, inorganic ions, lipids, enzymes, and other molecular compounds. It is the site of most cellular processes as it houses the organelles that make up the endomembrane system, as well as those that stand alone. The endoplasm is necessary for most metabolic activities, including cell division.

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更新时间:2025/6/20 8:26:38