Предмет: Английский язык, автор: krisnik27

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Secretion is a process generally brought about by an organ called a gland. A gland whether simple or complex in structure may be looked upon as a tube whose walls are composed of highly specialized epithelial cells, gland cells. The tube is closed at the end. In many glands the other end of the lumen opens up, either directly or by means of a special duct, onto a free surface, such as the skin, the in terior of the mouth, etc. The materials produced by the gland are poured onto this free surface, for which reason the secretion of this type of gland is spoken of as an external secretion. The gland is sur rounded by a dense network of capillaries.

The distinct process takes place in a gland: the gland cell serves as a transfer agency or it acts as a manufacturing plant or both. In the first instance, certain materials, water and NaCl are taken out of the cell, passed into the duct and secreted on a free surface. All types of glands transfer water in this manner.

Other glands take certain materials out of the blood stream and chemically transform them into new compounds, they then being poured into the duct. The activity of the gland is normally accompanied by a great dila tion of its blood vessels. Without this increased flow of blood a gland cannot function for any appreciable length of time. Nevertheless in many instances its blood flow in itself is not the direct cause of secretion, for by administering certain drugs it is possible to stop the secre tion completely although the flow of blood continues.

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Автор ответа: ruskov5
2
Секреция представляет собой процесс, как правило в результате орган, называемый железой. Железа ли простой или сложный в структуре может рассматриваться как трубка, стены которого состоят из узкоспециализированных эпителиальных клеток, клеток железы. Трубка закрыта в конце. В много желез другой конец Люмене открывает, либо непосредственно, либо с помощью специального воздуховода на свободной поверхности, такие как кожа, в terior рта, и др. Материалы, выпускаемые железы наливают на эту свободную поверхность, по которой причине секреции этого типа железа говорят о внешней секреции. Сальник-sur, округлые густой сетью капилляров. 

Собственный процесс происходит в железе: клетки железы служит в качестве агентства передачи или оно действует как завод или оба. В первую очередь некоторые материалы, воду и NaCl берутся из клетки, перешла в шахту и выделяется на свободной поверхности. Все виды желез передачи воды таким образом. 

Другие железы принимают некоторые материалы из потока крови и химически превратить их в новые соединения, они затем выливают в шахту. Деятельность железы обычно сопровождается большой dila Тион кровеносных сосудов. Без этого увеличения потока крови железы не может работать для любого значительного промежутка времени. Тем не менее во многих случаях его кровоток само по себе не является непосредственной причиной секреции, для управляющих некоторых лекарств можно полностью остановить испол Тион, хотя поток крови.


krisnik27: спасибо:)но в некоторых местах мне не понятно((
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