placenta

简明释义

英[pləˈsentə]美[pləˈsentə]

n. [胚] 胎盘；[植] 胎座

复 数 p l a c e n t a e 或 p l a c e n t a s

英英释义

单词用法

同义词

反义词

例句

1.The mouse babies were oversized because fat consumed by the mother causes the placenta to provide too many nutrients to the fetus, the study said.

研究表明，超大型鼠仔是由于母亲消耗的脂肪促使胎盘提供了过多的营养给胎儿而导致的。

2.The woman had probably been listening to her own pulse or blood flowing through the placenta, the doctors say.

医生说，这位妇女大概测听到的是自己的脉搏，或是胎盘中的血流，误以为胎儿一切正常。

3.More commonly, lost twins are discovered as tiny mummified attachments to the placenta of the live twin, after it is born.

更常见的是死去的孪生儿变成了微小的干尸，当存活婴儿出生的时候，附在其胎盘上。

4.Placenta previa occurs 6 to 15 times more often after a woman has had an abortion.

在女性人流后前置胎盘发生率会6- 15倍于常人。

5.The drug can be transferred to the baby via the placenta.

该药会通过胎盘传给胎儿。

6.The placenta is a rich source of vitamins, minerals, iron and protein and has long been thought to have medical, even mystical, properties.

胎盘富含维生素、矿物质、铁和蛋白质，长期以来被认为具有治疗，甚至是神奇的功效。

7.Sometimes it's an earlier test called CVS, or chorionic villus sampling, which collects a bit of tissue from the placenta.

有时候这是一个CVS早期检查或者叫作绒毛活检，从胎盘处获取绒毛组织。

8.Some women choose to consume their placenta after childbirth for its supposed health benefits.

一些女性选择在分娩后食用她们的胎盘，因为它被认为有健康益处。

9.The placenta produces hormones that are essential for maintaining pregnancy.

胎盘 产生对维持妊娠至关重要的激素。

10.After delivery, the doctor examined the placenta to ensure it was healthy.

分娩后，医生检查了胎盘以确保其健康。

11.The placenta acts as a barrier to protect the fetus from harmful substances.

胎盘 作为屏障，保护胎儿免受有害物质的影响。

12.During pregnancy, the placenta is crucial for nutrient transfer from the mother to the fetus.

在怀孕期间，胎盘 对于母亲与胎儿之间的营养转移至关重要。

作文

The human body is a marvel of biological engineering, and one of its most fascinating components is the placenta. The placenta is an organ that develops in the uterus during pregnancy, serving as a critical interface between the mother and the developing fetus. It plays several vital roles that are essential for the health and survival of the unborn child. Understanding the functions of the placenta can provide insights into the complexities of human development and maternal health.Firstly, the primary function of the placenta is to facilitate the exchange of nutrients and gases between the mother and the fetus. Through a network of blood vessels, the placenta allows oxygen and essential nutrients, such as glucose and amino acids, to pass from the mother’s bloodstream to the fetus. In return, it helps remove waste products like carbon dioxide and urea from the fetal blood, ensuring that the developing baby has everything it needs to grow and thrive.In addition to nutrient transfer, the placenta also produces hormones that are crucial for maintaining pregnancy. Hormones such as human chorionic gonadotropin (hCG), progesterone, and estrogen are secreted by the placenta and play significant roles in regulating the mother’s physiology. For instance, hCG is responsible for signaling the ovaries to stop releasing eggs and to maintain the uterine lining, creating a suitable environment for the embryo to implant and grow.Moreover, the placenta acts as a protective barrier, shielding the fetus from harmful substances and infections. While it is not entirely impermeable, the placenta selectively allows certain antibodies and nutrients to pass while blocking many pathogens and toxins. This selective permeability is crucial for the fetus's safety, as it helps minimize exposure to potentially harmful agents from the mother's environment.However, complications can arise with the placenta during pregnancy. Conditions such as placenta previa, where the placenta covers the cervix, or placental abruption, where the placenta detaches from the uterine wall prematurely, can pose serious risks to both the mother and the fetus. Understanding these potential issues underscores the importance of prenatal care and monitoring the health of the placenta throughout pregnancy.After childbirth, the placenta continues to play a role in maternal health. The delivery of the placenta is a critical step following the birth of the baby. Retained placenta can lead to severe complications, including excessive bleeding and infection. Therefore, healthcare providers closely monitor the delivery of the placenta to ensure that it is expelled completely and that the mother remains healthy.In conclusion, the placenta is an extraordinary organ that plays multiple essential roles in supporting fetal development and maternal health during pregnancy. Its ability to facilitate nutrient exchange, produce vital hormones, and protect the fetus makes it a topic of great interest in both medical research and education. As we continue to learn more about the placenta, we gain a deeper appreciation for the intricate processes involved in human reproduction and the importance of maternal-fetal health.

人体是生物工程的奇迹，其中一个最迷人的组成部分就是胎盘。胎盘是在怀孕期间在子宫内发育的器官，作为母亲与发育中的胎儿之间的重要界面。它发挥着几种至关重要的作用，这些作用对未出生孩子的健康和生存至关重要。理解胎盘的功能可以提供对人类发展和母体健康复杂性的深入了解。首先，胎盘的主要功能是促进母亲与胎儿之间的营养和气体交换。通过血管网络，胎盘使氧气和必需营养物质（如葡萄糖和氨基酸）从母亲的血液流向胎儿。作为回报，它帮助清除胎儿血液中的废物，如二氧化碳和尿素，确保发育中的婴儿拥有生长和繁荣所需的一切。除了营养转移外，胎盘还会产生对维持妊娠至关重要的激素。胎盘分泌的激素，如人绒毛膜促性腺激素（hCG）、孕酮和雌激素，在调节母亲生理方面发挥了重要作用。例如，hCG负责向卵巢发出信号，停止释放卵子并维持子宫内膜，创造适合胚胎植入和生长的环境。此外，胎盘充当保护屏障，保护胎儿免受有害物质和感染的侵害。虽然它并非完全不透，但胎盘选择性地允许某些抗体和营养物质通过，同时阻止许多病原体和毒素。这种选择性通透性对胎儿的安全至关重要，因为它有助于最小化母亲环境中潜在有害因子的暴露。然而，怀孕期间可能会出现与胎盘相关的并发症。像前置胎盘这样的情况，即胎盘覆盖宫颈，或胎盘早剥，即胎盘过早从子宫壁脱落，可能对母亲和胎儿造成严重风险。理解这些潜在问题强调了产前护理的重要性，并监测整个妊娠期胎盘的健康。在分娩后，胎盘继续在母亲健康中发挥作用。分娩后，胎盘的交付是婴儿出生后的一个关键步骤。滞留胎盘可能导致严重并发症，包括过度出血和感染。因此，医疗提供者密切监测胎盘的交付，以确保其完全排出，母亲保持健康。总之，胎盘是一种非凡的器官，在支持胎儿发育和母亲健康方面发挥着多重重要作用。它促进营养交换、产生重要激素和保护胎儿的能力，使其成为医学研究和教育中备受关注的话题。随着我们对胎盘的了解不断加深，我们更加欣赏人类生殖过程中涉及的复杂过程以及母胎健康的重要性。