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английский) 1:
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Urethra combine the kidney to the bladder. <br>The muscles in the urinary channel is constantly shrinking and relax, bringing urine from the kidneys. <br>The renal nephron perform almost all the functions of the kidneys. <br>Urea is produced after the breakdown of proteins in the body. <br>In the urine of a healthy person should not be bacteria, viruses and fungi. <br>The main function of nephrons - adjust the concentration of fluid in the body. <br>The bladder acts as a temporary reservoir for urine.
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