Lining

I read a line in my text stating "after 14 days of ovulation , if ovum is not fertilized , the lining of uterus degenerates and menstruation begins." Why does the endometrium degenerates ? Please Help!! :?

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When it is in the viens it is a deeper red purple but the blue you see is the outer lining of the vein. By the way inuyasha is the best!! :wink: inuyasha is the best

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How does the lining of the small intestine absorb the B12/intrinsic factor complex into the bloodstream? Does the B12 separate from the intrinsic factor or are the two absorbed as a unit?

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One of the distinguishing features of animals is that their cells do not have the thick outer lining known as a cell wall. Plant cells have a cell wall, as do fungi cells. Why would such a feature be advantageous for plants, but disadvantageous for animals?

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... to the parent cell. Mitosis happens all over your body all the time, replacing damaged or aged tissue. According to this Q&A , the cells lining your small intestine get replaced every week. So, mitosis provides continuity, because a parent cell gives rise to daughter cells, propagating ...

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