WEBVTT

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Ebben a videóban a
sejthártyáról fogok beszélni.

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Kezdjük egy kis emlékeztetővel a dolgot.

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Ez itt egy sejt, a közepén egy sejtmaggal.

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A sejthártya az a réteg,
ami a sejtet kívülről borítja,

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és megvédi azt a környezeti behatásoktól.

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A sejthártya nélkül
nem maradhatnánk életben,

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mivel nem lenne semmi, ami megvédene és
elválasztana minket a külvilágtól.

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A következőkben a sejthártya
három fő összetevőjét fogom bemutatni,

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a foszfolipideket, a koleszterint
és a fehérjéket.

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Kezdjük is a foszfolipidekkel,

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amik a sejthártya jelentős részét
teszik ki.

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Hogy ne menjen ezzel az idő,

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előre megrajzoltam
ezt az ábrát a sejthártyáról.

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Ezek az apró alkotórészek
mind foszfolipideket ábrázolnak,

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ezek a molekulák valahogy így néznek ki:

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Rendelkeznek egy poláris „fejjel”, ami
legfőképp a foszfátcsoport miatt poláris,

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a másik végükön pedig
két zsírsavlánc található.

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Jellemzően így ábrázoljuk
a foszfolipideket.

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A sejthártyában ezek a foszfolipidek
szoros rendben igazodnak egymáshoz,

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és ez a rend a membrán
teljes egészén jellemző.

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Ez az ábra egy ilyen membrán
keresztmetszetét ábrázolja,

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lényegében egy félbevágott membránt
nézünk oldalról.

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