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Schwangerschaft

Schwangerschaft

          
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About the Book

Examensarbeit aus dem Jahr 2004 im Fachbereich Biologie - Humanbiologie, Note: 2,0, Westfälische Wilhelms-Universität Münster, Sprache: Deutsch, Abstract: Der Beginn einer Schwangerschaft, die Vereinigung von männlicher Samenzelle und weiblicher Eizelle, vollzieht sich zunächst einmal ganz unbemerkt. Damit diese Vereinigung überhaupt geschehen kann, hat die Natur reichlich vorgesorgt. Bereits bei der Geburt sind in jedem Eierstock einer Frau 250.000 potentielle Eizellen angelegt, viel mehr, als je gebraucht werden. Auch beim Mann herrscht große "Verschwendung" Bei jedem sexuellem Höhepunkt werden etwa 100 bis 500 Millionen Spermien freigegeben. Angesichts dieser großen Zahlen müsste die Chance, dass Spermie und Eizelle aufeinander treffen relativ groß sein. Dennoch ist diese Chance in der Realität nicht sehr groß, da viele "Zufälle" aufeinander treffen müssen, damit eine Schwangerschaft beginnen kann. In der Mehrzahl der Zyklen wird nur eine Eizelle so weit entwickelt, dass sie befruchtungsfähig ist. Hat sich eine Eizelle so weit entwickelt, ist sie aber nur sechs bis acht Stunden nach dem Eisprung bereit, sich mit dem Spermium zu vereinigen. Trifft die Eizelle in diesem Zeitraum nicht auf ein Spermium, kommt es in diesem Zyklus nicht zu einer Schwangerschaft. Zudem ist der Weg der Spermien von der Vagina durch die Gebärmutter zu den Eileitern, wo sich die Eizelle befindet, lang und beschwerlich, nur wenige kommen überhaupt an das Ziel. Sind die ersten Hindernisse überwunden, ist dies noch keine Garantie für einen guten Start ins Leben. Bis zur Implantation muss der Keim durch den Eileiter sicher weiterbefördert werden, um sich in die üppig aufgebaute Gebärmutterschleimhaut einzubetten. Hier erst startet die Entwicklung des eigentlichen Lebens. Die Schwangerschaft ist für eine Frau wohl eine der spannendsten Erfahrungen des Lebens überhaupt. Aus zwei einzelnen Zellen entsteht ein Meisterwerk der Natur, das sich rasant entwickelt und innerhalb kurzer Zeit zu einem


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Product Details
  • ISBN-13: 9783638698153
  • Publisher: Grin Publishing
  • Binding: Paperback
  • Language: German
  • Returnable: N
  • Spine Width: 8 mm
  • Weight: 177 gr
  • ISBN-10: 3638698157
  • Publisher Date: 29 Jul 2007
  • Height: 210 mm
  • No of Pages: 128
  • Series Title: German
  • Sub Title: Pränatale Entwicklung und Vorsorge
  • Width: 148 mm


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