Недеља, Јун 21, 2009

Људско тело у бројкама

 Људско тело је универзум који чине ћелије, молекули и атоми. У човековом телу ради 100 000 милијарди ћелија, 15 000 пута више него што на нашој планети има људи. Само наш имуни систем има 1000 милијарди лимфоцита као и 100 трилиона нарочитих молекула такозваних антитела која при свакој најезди страних тела ступају у борбу као какве невидљиве одбрамбене ракете.

 Без одмора, целог живота, мења се ова невидљива биолошка заједница: тело производи сваке секунде око 7 милиона нових ћелија. Сваког дана у њему изумре 600 милијарди једних ћелија и створи се исто толико нових, Десет на 28. степен атома које тело створи протичу кроз њега као невидљиви ток времена. Они се стварају и трансформишу обнављајући наше месо и крв: скоро свака 24 часа настају нове стомачне жлезде, свака три дана нова слузокожа стомака и црева, сваких шест седмица нова јетра, сваког месеца нова кожа, на  сваких неколико месеци потпуно нов скелетни систем. Неосетљиво и без напора одвија се ова биолошка смена док наше срце свакодневно откуцава 100 000 пута, а ми удахнемо и издахнемо 25 000 пута.

 

 

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