No, that statement is not correct. The concentration of sodium in blood plasma is directly related to the amount of sodium in our body. Sodium is an essential electrolyte that plays a crucial role in maintaining fluid balance, nerve function, and muscle contraction.

The concentration of sodium in blood plasma is regulated by various mechanisms in the body, including the kidneys, which help maintain a stable sodium concentration. When the body needs to retain more water, such as during dehydration, the kidneys conserve sodium, leading to an increase in the concentration of sodium in the blood plasma. Conversely, when the body needs to eliminate excess water, such as during excessive fluid intake, the kidneys excrete more sodium, resulting in a decrease in the concentration of sodium in the blood plasma.

Therefore, changes in the concentration of sodium in blood plasma reflect the body's overall sodium balance. If there is an imbalance in sodium intake or excretion, it can lead to conditions such as hyponatremia (low sodium levels) or hypernatremia (high sodium levels), which can have significant health implications.

In summary, the concentration of sodium in blood plasma is a reflection of the real amount of sodium in our body and is tightly regulated to maintain proper physiological function.
No, the concentration of sodium in blood plasma isn't entirely independent of the total amount of sodium in your body. While concentration refers to how much sodium is dissolved in a specific volume (blood plasma in this case), it does reflect the body's overall sodium balance