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Kidneys. "Mammals have highly developed kidneys that help control the composition of body fluids... The kidneys of mammals help maintain homeostasis by filtering urea from the blood, as well as by excreting excess water or retaining needed water."

References:
Miller, K. R., & Levine, J. (2006). Biology. Boston, MA: Pearson Education.

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5mo ago

The composition and levels of body fluids in mammals are primarily controlled by the kidneys through processes such as filtration, reabsorption, and secretion. Hormones like aldosterone and antidiuretic hormone also play a role in regulating fluid balance by influencing water reabsorption and electrolyte levels in the body. Additionally, the renin-angiotensin-aldosterone system helps regulate blood pressure and fluid balance.

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