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زیست شناسی گرگان - علت نامگذاری شیردان چیست؟

امروز:

علت نامگذاری شیردان چیست؟

یکی از سوالات دانش آموزان اینست که چرا به بخشی از معده نشخوار کنندگان شیردان می گویند؟ آیا رابطه ای با تولید شیر و یا پستان دارد؟
جواب:
خیر . در واقع شیردان بخش آخر از معده 4 قسمتی نشخوارکنندگان است که به آن معده حقیقی نیز می گویند زیرا آنزیم های گوارشی و غدد معده در این بخش قرار دارند و عمل حقیقی گوارش شیمیایی غذا در این قسمت  انجام میگیرد و از طرفی از همین بخش است که مایه پنیر و یا همان آنزیم رنین را جدا می کنند و در پنیر سازی از آن استفاده می کنند.
بهمین علت از قدیم به این بخش معده که شیر در آنجا دلمه شده و اعمال گوارشی روی ان انجام میگیرد، شیردان می گویند.


نوشته شده در : چهارشنبه 8 بهمن 1393  توسط : شریفی زاده .    نظرات() .

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