Page 38 - Human anatomy COMPLETELY DONE1

Primary urine contains, along with dissimilation products, amino acids, glucose,
and many other compounds necessary for the body. There are no proteins from blood
plasma in the primary urine only. This is understandable: after all, proteins are not
filtered.
The second stage of urine formation consists in the fact that primary urine passes
through a complex system of tubules, where substances and water necessary for the
body are sequentially absorbed. Everything harmful to the vital activity of the body
remains in the tubules and in the form of urine is excreted from the kidneys through the
ureters into the bladder. This final urine is called secondary.
The structure of the nephron and the process of urine formation (figure 25).
Each nephron begins with a Bowman capsule, it is also called simply a nephron
capsule. Small arteries enter the concave depression formed by it, which branch
repeatedly and form a glomerulus of capillaries. The pressure in them is higher than in
other organs. Therefore, blood plasma seeps into the space formed by the walls of the
Bowman capsule.

Figure 25. The structure of the nephron

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