Lecture № 7-9. STRUCTURE AND FUNCTION of CELLULAR ORGANELLES

Membrane organellas of cytoplasm.

1. Structure and function of an endoplasmic network, Golgi's device and lysosomes

2. Structure and function of the device of Golgi

3. Structure and functions of mitochondrions

4. Structure and functions of plastids

Membrane organellas of cytoplasm. Cytoplasm organellas

Organellas — the microstructures, constantly present and obligatory for all cages which are carrying out the vital functions.

Classification of organellas.

Distinguish membrane and nemembrany organellas. Mitochondrions, an endoplasmic network, Golgi's device, lysosomes belong to membrane organellas. Not membrane organellas: free ribosomes and polysom, microtubules, tsentriol and filament (mikrofilament, intermediate filament). In many cages of an organella can take part in formation of special structures, characteristic for specialized cages. So, eyelashes and zhgutik are formed at the expense of a tsentrioly and plasmatic membrane, a microfiber — these are outgrowths of a plasmatic membrane with gialoplazmy and mikrofilament, an akrosoma to sperm — this derivative elements of the device of Golgi, "ellipsoid" of visual cages — congestions of mitochondrions and so forth.

Membrane organellas

Membrane organellas represent single or connected with each other cut the cytoplasms delimited by a membrane from the gialoplazma surrounding them having own contents, excellent on structure, properties and functions from other parts of a cage etc. these are the closed, closed volume zones — kompartment. In a gialoplazma membrane organellas are distributed naturally. An endoplasmic network, various vacuoles arising from it make vakuolyarny system of cytoplasm, system of synthesis and intracellular transport of substances. Besides, lysosomes, autolizosoma and peroksisoma are its part Golgi's complex. For all elements of vakuolyarny system existence of one limiting membrane is characteristic.

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