Cell science (81-2-3) 蔡国平
细胞科学 Cell Science （8.1-2-3） 蔡国平
s8 Cytoplasmic membrane systems: Cytoplasmic Membrane System or Cytomembranes Internal Membrane or Endomembrane System (EMS) includes: nuclear envelopes, endoplasmic reticulum (ER), Golgi complex(GC), lysosomes and a variety of vesicles or vacuoles. Although each of these membranous organelles has its own distinct structure and function, taken togather they forman endomem brane system in which the individual components function as part of a coordinated unit Several other membranous organelles in cytoplasm--mitochandria, peroxisomes, an d chloroplasts-are not part of this interconnected system
§ 8 Cytoplasmic membrane systems: Cytoplasmic Membrane System or Cytomembranes Internal Membrane or Endomembrane System (EMS) includes: nuclear envelopes, endoplasmic reticulum (ER), Golgi complex (GC), lysosomes and a variety of vesicles or vacuoles. Although each of these membranous organelles has its own distinct structure and function, taken togather they form an endomembrane system in which the individual components function as part of a coordinated unit. Several other membranous organelles in cytoplasm—mitochandria, peroxisomes, and chloroplasts—are not part of this interconnected system
gure 141 Electron mIcrograph of part a liver cell seen in cross-section endosome embrane- bounded compartments peroxisome Golgi apparatus endoplasmic hembrane-bound nucleus membrane 15g igure 14-2 The major membrane- bounded organelles of an animal cell. This cell from the lining of the intestine contains the basic set of organelles found in most animal cells. The nucleus, endo The Relative Volumes Occupied by the Major plasmic reticulum(ER), Golgi apparatus, Membrane-bounded Organelles in a lysosomes, endosomes, mitochondria, and Liver Cell (Hepatocyte) peroxisomes are distinct compartments Intracellular Percent of Approximate eparated from the cytosol (gray) by at Compartment Total Cell Volume Number per Cell least one selectively permeable mem Cytosol brane. Ribosomes are also shown, even Mitochondria though they are not enclosed by a mem Endoplasmic reticulum 522 brane and are too small to be seen in a Nucleus ght microscope and therefore do not fit Golgi apparatus the original definition of an organelle Peroxisomes 631 400 Some ribosomes are found free in the LysoSome cytosol, while others are bound to the Endosomes cytosolic surface of the ER
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Plasma membrane Extracellular medium Endocytic vesicle Nuclear envelope Transport endosome Late endosome vesicles neoplasm Ribosomes reticulum endoplasmic reticulum Peroxison Cytosol Figure 12-1 Cellular Structures Discussed in This Chapter. The interior of the endoplasmic reticulum, in turn, is linked to the This chapter focuses on the endoplasmic reticulum, the Golgi complex, interiors of the Golgi complex, endosomes, and lysosomes by transport endosomes, lysosomes, and peroxisomes. Also relevant to the vesicles that shuttle from organelle to organelle. Together, the discussion are the nuclear envelope and plasma membrane. The urrounding membranes and internal spaces of these structures define perinuclear space between the two membranes of the nuclear the endomembrane system of the eukaryotic cell; the remaining envelope is continuous with the interior of the endoplasmic reticulum. portion of the cytoplasm is called the cytosol
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Gola complex ER Secretory ' x d vesicle 3