Answer:
kidneys
Explanation:
Considered as a complex purification machinery, they have a function of both elimination and regulation of internal liquids. They excrete water, but they also conserve it; they eliminate through the urine all the products of the metabolism of foods that can be potentially harmful, before they reach toxic levels and return to the blood: water, glucose (sugar), salt, potassium and many other vital substances in the amounts adequate to keep the internal environment stable despite variations in climate, diet and other external factors.
The anatomical part that performs this function is the nephron (Fig. 3) that contains a “filter” called the glomerulus, which, in turn, contains a network of tiny blood vessels called capillaries. We have more than 2 million nephrons formed by those microscopic filters and tubules that would cover more than 80 km if they extended one after the other. There is a complicated exchange of chemical substances so that waste and excess water leave the blood and enter the urinary system. It is not a simple filtering process, it is somewhat more complex where a reabsorption and excretion process is also performed. After filtering, the mixture of waste and chemical substances is “reviewed” with the objective of “recovering” (through a resorption process) those that could still be useful.
This urine is transported involuntarily and continues to a funnel-shaped cavity (renal pelvis), from where it passes to the ureters that lead to the bladder where it accumulates and from where it is eliminated through the voluntary act of urination
