胎盘

How does a developing baby breathe?
::一个正在发育的婴儿如何呼吸?

Or eat? From mom, of course. Shown is a detailed representation of the placenta . And this is where all these interactions occur.
::当然是妈妈送的 这是胎盘的详细说明 所有的相互作用都是在这里发生的

Placenta and Related Structures
::胎盘及相关结构

The fetus could not grow and develop without oxygen and nutrients from the mother. Wastes from the fetus must also be removed in order for it to survive. The exchange of these substances between the mother and fetus occurs through the placenta.
::没有母亲的氧气和养分,胎儿就无法生长和发育,还必须清除胎儿的废物,以便存活下来,这些物质在母亲和胎儿之间通过胎盘进行交换。

Placenta
::笔记本笔记本笔记

The placenta is a temporary organ that begins to form from the trophoblast layer of shortly after implantation . The placenta continues to develop and grow to meet the needs of the growing fetus. A fully developed placenta is made up of a large mass of from both the mother and fetus. The maternal and fetal vessels are close together but separated by tiny spaces. This allows the mother’s and fetus’s to exchange substances across their capillary walls without the blood actually mixing. 
::胎盘是一种临时器官,从植入后不久的峰值层开始形成。胎盘继续发展和成长,以满足不断成长的胎儿的需要。完全发达的胎盘由母亲和胎儿的大批胎盘组成。母胎和胎盘紧密相连,但被很小的空间隔开。 这使得母胎和胎儿可以在没有实际血液混合的情况下在阴道墙上交换物质。

The fetus is connected to the placenta through the umbilical cord , a tube that contains two arteries and a vein . Blood from the fetus enters the placenta through the umbilical arteries, exchanges gases and other substances with the mother’s blood, and travels back to the fetus through the umbilical vein.
::胎儿与胎盘有关联,通过子宫颈带连接到胎盘。 胎盘中有两条动脉和血管。 胎儿的血液通过胎盘动脉进入胎盘,用母亲的血液交换气体和其他物质,然后通过细胞血管回到胎盘。

Amniotic Sac and Fluid
::羊水和氟化物

Attached to the placenta is the amniotic sac , an enclosed membrane that surrounds and protects the fetus. It contains amniotic fluid , which consists of and dissolved substances. The fluid allows the fetus to move freely until it grows to fill most of the available space. The fluid also cushions the fetus and helps protect it from injury.
::胎盘附在胎盘上,它是一种封闭的胎膜,环绕胎儿并保护胎儿,它含有由物质组成并溶解的羊膜液,它允许胎儿自由行动,直到它生长到能填充大部分现有空间为止。它也缓缓着胎儿,帮助保护胎儿免受伤害。

Summary
::摘要

播放段落
• The placenta allows nutrients and wastes to be exchanged between the mother and fetus.
  ::胎盘允许母胎和胎儿之间交换养分和废物。
播放段落
• The fetus is connected to the placenta through the umbilical cord.
  ::胎儿和胎盘有关联 是通过肾系骨髓连接的

Review
::回顾

播放段落
1. What makes up a placenta?
   ::胎盘是什么构成的?
播放段落
2. Describe the role of the placenta in fetal development.
   ::描述胎盘在胎儿发育中的作用。
播放段落
3. What is the umbilical cord? What occurs in the umbilical cord?
   ::琌ぐ或琌或ㄆ