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#1 |
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人到万难须放胆,事当两可要平心
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#2 |
不愿流光把人抛
![]() ![]() ![]() ![]() ![]() ![]() 注册日期: Jan 2005
帖子: 28,439
积分:143
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声望: 119305395
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#3 |
不愿流光把人抛
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帖子: 28,439
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#4 |
不愿流光把人抛
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#5 |
不愿流光把人抛
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People with different blood types have proteins specific to that blood type on the surfaces of their red blood cells (RBCs). There are four blood types — A, B, AB, and O. Each of the four blood types is additionally classified according to the presence of another protein on the surface of RBCs that indicates the Rh factor. If you carry this protein, you are Rh positive. If you don't carry the protein, you are Rh negative. Most people — about 85% — are Rh positive. But if a woman who is Rh negative and a man who is Rh positive conceive a baby, there is the potential for a baby to have a health problem. The baby growing inside the Rh-negative mother may have Rh-positive blood, inherited from the father. Approximately half of the children born to an Rh-negative mother and Rh-positive father will be Rh positive. Rh incompatibility usually isn't a problem if it's the mother's first pregnancy because, unless there's some sort of abnormality, the fetus's blood does not normally enter the mother's circulatory system during the course of the pregnancy. However, during delivery, the mother's and baby's blood can intermingle. If this happens, the mother's body recognizes the Rh protein as a foreign substance and can begin producing antibodies (protein molecules in the immune system that recognize, and later work to destroy, foreign substances) against the Rh proteins introduced into her blood. Other ways Rh-negative pregnant women can be exposed to the Rh protein that might cause antibody production include blood transfusions with Rh-positive blood, miscarriage, and ectopic pregnancy. Rh antibodies are harmless until the mother's second or later pregnancies. If she is ever carrying another Rh-positive child, her Rh antibodies will recognize the Rh proteins on the surface of the baby's blood cells as foreign, and pass into the baby's bloodstream and attack those cells. This can lead to swelling and rupture of the baby's RBCs. A baby's blood count can get dangerously low when this condition, known as hemolytic or Rh disease of the newborn, occurs. |
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感谢 红樱桃,绿芭蕉 此篇文章之用户: |
090826 (Feb 3rd, 2010) |
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#6 |
不愿流光把人抛
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#7 |
不愿流光把人抛
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帖子: 28,439
积分:143
精华:46
声望: 119305395
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#8 |
不愿流光把人抛
![]() ![]() ![]() ![]() ![]() ![]() 注册日期: Jan 2005
帖子: 28,439
积分:143
精华:46
声望: 119305395
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#9 |
不愿流光把人抛
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帖子: 28,439
积分:143
精华:46
声望: 119305395
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感谢 红樱桃,绿芭蕉 此篇文章之用户: |
crystal1104 (Feb 3rd, 2010) |
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#10 |
不愿流光把人抛
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帖子: 28,439
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#11 |
不愿流光把人抛
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帖子: 28,439
积分:143
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声望: 119305395
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#12 |
不愿流光把人抛
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帖子: 28,439
积分:143
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声望: 119305395
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#13 |
不愿流光把人抛
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帖子: 28,439
积分:143
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声望: 119305395
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#14 |
不愿流光把人抛
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帖子: 28,439
积分:143
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声望: 119305395
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#15 |
不愿流光把人抛
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帖子: 28,439
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声望: 119305395
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#16 |
不愿流光把人抛
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帖子: 28,439
积分:143
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声望: 119305395
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#17 |
不愿流光把人抛
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帖子: 28,439
积分:143
精华:46
声望: 119305395
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