过滤和意图的区别bsorption

Thekey differencebetween filtration and reabsorption is that过滤is the first step of urine formation in which blood is filtered viaglomerulus的nephron虽然重吸收是尿液形成的第二步，其中必要的营养素从肾小球滤液中恢复为血液。

Metabolism, not only produces necessary products, but it also generates a lot of unwanted products inside our bodies. However, theexcretion过程快速运行，并从我们的身体中去除这些废物。肾脏是进行排泄物的主要器官。人类有一对肾脏。

Kidney has a good blood supply, and it regulates the composition of blood in a regular state. Therefore, kidneys are important inhomeostasis。肾脏的基本结构和功能单元是肾单位。每个肾脏大约有100万个肾单位。每个肾单位都包含六个主要区域：肾球体，近端复杂的小管，亨勒环的下降肢体，亨勒环的升肢，远端曲折小管和收集管道。血液纯化和尿液形成主要发生在肾单位中。尿液形成的三个主要步骤：超滤，选择性重吸收和分泌。

内容

1.Overview and Key Difference
2.What is Filtration
3.什么是重吸收
4.过滤和重吸收之间的相似性
5.并排比较 - 表格形式的过滤与重吸收
6。概括

什么是过滤？

过滤是尿形成的第一步。它发生在压力下的肾囊中。压力来自血液泵的压力。血液在高压下直接从心脏直接进入肾小球。肾小球是肾囊中的毛细血管结。这些毛细血管的直径小于肾动脉的直径。因此，当血液进入狭窄的毛细血管时，压力在肾囊内增加。

Moreover, the diameter of the efferent arteriole is less than that of afferent arteriole diameter. Thus, this increases the blood pressure in the glomerulus. At this point, water and small molecules are squeezed out of the capillaries through the epithelium of the renal capsule into the interior of the capsule. We call this filtrate glomerular filtrate, and it has the composition of blood, but it doesn’t have large blood proteins, platelets, and other large molecules.

什么是重吸收?

Filtration produces about 125 cm3 of glomerular filtrate per minute in humans and 1.5 dm3 of urine per day. Thus, a great deal of reabsorption must occur. Furthermore, the filtrate contains a lot of essential nutrients for the body. Hence, reabsorption is an essential step at this moment in order to uptake necessary nutrients and excrete unnecessary waste. Essential molecules are reabsorbed to the blood from the filtrate through selective reabsorption.

Moreover, this process takes place as the filtrate passes through various sections of nephrons. Some areas are specifically adapted to reabsorb certain elements only. Largest reabsorption takes place in the proximal convoluted tubule in which glucose, amino acids, ions, water vitamins, hormones, about 80% of NaCl are reabsorbed to the blood. The loop of Henle reabsorbs water and sodium chloride. Due to the reabsorption, filtrate becomes concentrated. Finally, it excretes from the body as urine.

What are the Similarities Between Filtration and Reabsorption?

• 过滤和重吸收是尿液形成的两个步骤。
• Both take place in the nephrons.

What is the Difference Between Filtration and Reabsorption?

过滤是尿形成的第一步，发生在肾单位的肾小球中。鉴于，重吸收是在肾单位的其他部分发生的第二步。因此，这是过滤和重吸收之间的关键区别。通过肾小球毛细血管过滤到肾囊。当肾小球滤液沿着近端复杂的小管行进时，亨勒环的降肢，亨勒环和远端杂质小管的上升肢，将必要的营养物质重新吸收到血液中。此外，过滤和重吸收之间的另一个区别是，过滤不是一个非常选择性的过程，但是重吸收是高度选择性的。

以下信息图总结了过滤和重吸收之间的差异。

摘要 - 过滤与重吸收

Filtration and reabsorption are two major steps in urine formation. Filtration occurs first and then reabsorption occurs. During filtration, blood filters inside the renal capsule and forms the glomerular filtrate. During reabsorption, necessary nutrients in the glomerular filtrate are reabsorbed back to the blood from the rest of the parts of the nephron. Unlike filtration, reabsorption is selective. Thus, this is a summary of the difference between filtration and reabsorption.

Reference:

1. “Nephron – Definition, Function and Structure.” Biology Dictionary, Biology Dictionary, 29 Apr. 2017,Available here。

Image Courtesy:

1. “Kidney nephron molar transport diagram” By Nephron-urine.svg: M•Komorniczak -talk-, polish wikipedist.Kidney_nephron_molar_transport_diagram.png: *Nephron-urine.svg: M•Komorniczak -talk-, polish wikipedist.derivative work: Juvo415 (talk)derivative work: Mcstrother (talk) – Nephron-urine.svgKidney_nephron_molar_transport_diagram.png (CC BY-SA 3.0) viaCommons Wikimedia
2. OpenStax College - 解剖与生理学Connexions Web site，2013年6月19日。(CC BY 3.0)viaCommons Wikimedia