The sodium concentration of the blood is primarily regulated by the

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The kidneys play a crucial role in regulating the concentration of sodium in the blood, by filtering out excess sodium and reabsorbing or excreting the appropriate amount depending on the body's needs. The small intestine absorbs sodium from the food we eat, but it does not play a significant role in regulating blood sodium levels. The large intestine primarily absorbs water, not sodium. The brain plays a role in regulating sodium levels through thirst and salt cravings, but it does not directly regulate blood sodium levels.

The Sodium Concentration of the Blood Is Primarily Regulated by the