placentation

简明释义

英[ˌplæs(ə)nˈteɪʃ(ə)n]美[ˌplæsənˈteɪʃn]

n. [胚] 胎盘形成

英英释义

单词用法

同义词

反义词

例句

1.These results lead us to propose that HLA-G may contribute to placentation during early and mid-term pregnancy, and participate in maintaining gestation during term pregnancy.

由此推测HLA-G在妊娠早、中期与胎盘形成有关，在妊娠晚期可能参与妊娠维持。

2.These results lead us to propose that HLA-G may contribute to placentation during early and mid-term pregnancy, and participate in maintaining gestation during term pregnancy.

由此推测HLA-G在妊娠早、中期与胎盘形成有关，在妊娠晚期可能参与妊娠维持。

3.Green Grams ovary consists of singe carpel, one locule, cantaining 9—13 campylotropous ovules bearing at the marginal placentation.

绿豆子厉由单心皮构成，1室，有9—13个弯生胚珠着生在边缘胎座上。

4.Thus HGF intimately relates to HDCP with regulation of invasion of trophoblast, anti-apoptosis and regulation of placentation.

HGF在调节滋养细胞浸润能力、抗细胞凋亡和胎盘发生方面与妊娠期高血压疾病关系密切。

5.The carpel closed toward and connected with the ovary central column to form axile placentation since mid October.

十月中旬起心皮向内合生并与中轴连合形成中轴胎座。

6.Ovary usually 3-loculed and placentation axile.

子房通常的3室和中轴胎座。

7.The study of placentation helps us understand the development of the placenta during pregnancy.

对胎盘形成的研究帮助我们理解怀孕期间胎盘的发展。

8.Different species exhibit various types of placentation that affect fetal nourishment.

不同物种表现出各种类型的胎盘形成，影响胎儿的营养供应。

9.Abnormalities in placentation can lead to complications during pregnancy.

在胎盘形成中的异常可能导致怀孕期间的并发症。

10.Research on placentation is crucial for improving maternal and fetal health.

对胎盘形成的研究对改善母婴健康至关重要。

11.The process of placentation involves the implantation of the embryo into the uterine wall.

在胎盘形成过程中，胚胎植入到子宫壁中。

作文

The process of reproduction is a fascinating subject that encompasses various biological mechanisms, one of which is known as placentation. In simple terms, placentation refers to the formation and development of the placenta during pregnancy. The placenta is a vital organ that connects the developing fetus to the uterine wall, allowing for the exchange of nutrients, waste, and gases between the mother and the fetus. Understanding placentation is crucial for comprehending how life begins and develops in mammals, including humans. During the early stages of pregnancy, after fertilization occurs, the zygote undergoes several divisions to form a blastocyst. This blastocyst then implants itself into the uterine lining, where placentation begins. There are different types of placentation, which can vary among species. For instance, in humans, the placenta is classified as an invasive type, meaning it deeply penetrates the uterine tissue. This allows for a more efficient exchange of nutrients and oxygen, which is essential for the growing fetus. The structure of the placenta is quite complex, consisting of both maternal and fetal tissues. The fetal portion of the placenta develops from the trophoblast cells of the blastocyst, while the maternal portion arises from the endometrial cells of the uterus. This dual origin is significant because it allows for the establishment of a specialized interface that can regulate the transfer of substances between the mother and fetus. The efficiency of this interface is critical; any disruption can lead to complications such as preeclampsia or placental abruption. Moreover, placentation plays a critical role in hormonal regulation during pregnancy. The placenta produces several hormones that are essential for maintaining pregnancy and supporting fetal development. For example, human chorionic gonadotropin (hCG) is produced shortly after implantation and helps to maintain the corpus luteum, which in turn produces progesterone to support the pregnancy. Other hormones such as estrogen and progesterone are also produced by the placenta, contributing to the physiological changes that occur in the mother’s body throughout pregnancy. In addition to its role in nutrient and gas exchange, the placenta also serves as a protective barrier. It helps to shield the fetus from harmful substances and pathogens, although not all substances are filtered out effectively. This aspect of placentation highlights the importance of maternal health during pregnancy, as factors such as drug use, smoking, and certain infections can adversely affect both the placenta and the developing fetus. Overall, the study of placentation is essential for understanding reproductive biology and addressing various pregnancy-related issues. Researchers continue to explore the intricacies of placental development and function, seeking to uncover the underlying mechanisms that govern this critical process. Advances in this field can lead to improved prenatal care and better outcomes for both mothers and their babies. As we deepen our understanding of placentation, we are reminded of the incredible complexity of life and the delicate balance required for successful reproduction. In conclusion, placentation is not merely a biological term; it represents a crucial aspect of mammalian reproduction that has profound implications for maternal and fetal health. By studying placentation, we gain insights into the fundamental processes that sustain life, emphasizing the importance of nurturing both the mother and the developing child during pregnancy.

生殖过程是一个迷人的主题，涵盖了各种生物机制，其中之一被称为胎盘形成。简单来说，胎盘形成是指在怀孕期间胎盘的形成和发展。胎盘是一个重要的器官，将发育中的胎儿与子宫壁连接起来，使母亲与胎儿之间可以交换营养、废物和气体。理解胎盘形成对于理解生命如何开始和在哺乳动物中（包括人类）发展至关重要。 在怀孕的早期阶段，受精发生后，合子经历几次分裂以形成囊胚。然后，这个囊胚植入子宫内膜，胎盘形成便开始了。不同物种之间存在不同类型的胎盘形成。例如，在人类中，胎盘被归类为侵入性类型，意味着它深深渗透到子宫组织中。这允许更有效地交换营养和氧气，这对生长中的胎儿至关重要。 胎盘的结构相当复杂，由母体和胎儿组织组成。胎盘的胎儿部分由囊胚的滋养层细胞发育而来，而母体部分则源于子宫的内膜细胞。这种双重起源是重要的，因为它允许建立一个特殊的界面，可以调节母亲和胎儿之间物质的转移。这个界面的效率至关重要；任何干扰都可能导致妊娠高血压或胎盘早剥等并发症。 此外，胎盘形成在怀孕期间的激素调节中也起着关键作用。胎盘产生几种对维持妊娠和支持胎儿发育至关重要的激素。例如，人绒毛膜促性腺激素（hCG）在植入后不久产生，有助于维持黄体，进而产生孕酮以支持妊娠。其他激素如雌激素和孕酮也由胎盘产生，促进母体在整个妊娠期间发生的生理变化。 除了在营养和气体交换中的作用外，胎盘还充当保护屏障。它有助于保护胎儿免受有害物质和病原体的侵害，尽管并非所有物质都能有效过滤。这一方面的胎盘形成突显了怀孕期间母体健康的重要性，因为药物使用、吸烟和某些感染等因素可能会对胎盘和发育中的胎儿产生不利影响。 总的来说，研究胎盘形成对理解生殖生物学和解决各种与妊娠相关的问题至关重要。研究人员继续探索胎盘的发育和功能的复杂性，试图揭示支配这一关键过程的基本机制。这一领域的进展可以改善产前护理，并为母亲和婴儿带来更好的结果。当我们加深对胎盘形成的理解时，我们被提醒生命的复杂性以及成功繁殖所需的微妙平衡。 总之，胎盘形成不仅仅是一个生物学术语；它代表了哺乳动物生殖的一个关键方面，对母体和胎儿的健康具有深远的影响。通过研究胎盘形成，我们获得了对维持生命的基本过程的深入见解，强调了在怀孕期间照顾母亲和发育中的孩子的重要性。