Предмет: Окружающий мир, автор: tkuliyeva1975

Соберите информацию с которыми сталкиваются космонавты в космосе.​

Ответы

Автор ответа: happyhands2020
2

Ответ:

Вообще-то при микрогравитации становится плохо не только рыбьим скелетам. Потеря костной ткани — одна из самых серьезных проблем, с которыми сталкиваются космонавты во время и после вахты на МКС. Проявления потери напоминают старческий остеопороз, хотя космонавты сталкиваются с ней задолго до старости — кости становятся более хрупкими и ломкими, теряют кальций. Изменения на клеточном уровне заметны сразу после полета в пикирующем самолете.

Клеточный механизм потери костной ткани до сих пор оставался невыясненным. Известно, что невесомость меняет в живом организме многое — так, сердце постепенно теряет навык ускоряться при резком изменении давления. Из-за этого космонавты, вернувшиеся на Землю, падают в обмороки от резких движений. Изменения происходят и на уровне генной экспрессии и наблюдались при сборе биоматериалов у космонавтов.

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The Keane family from  England had a two-week holiday in South Carolina, USA.

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 I like nice English gardens with lots of flowers. All the Millers had  a few trees." And Katy didn't think much of the decor either. "It was all very smart and clean " she said, "but it wasn't very colourful. It's obvious that Americans spend more time outdoors than the British! We had good weather, but luckily we didn't need to use the air-conditioning system. The Millers had lots of security systems and alarms that we had to  fiddle with every night and morning - that was complicated enough!"


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