The figure below illustrates how the nephron in a human kidney aids in the removal of toxic by-products of protein metabolism and assists in the regulation of internal water and solute concentrations. 
In the region of the nephron labeled "tubule," sodium is
Definitions:
Attribution Theory
A social psychology theory focused on how individuals interpret and assign causes to their own and others' behaviors.
Actor-observer Bias
The tendency to attribute one's own actions to external causes while attributing others' actions to internal characteristics.
Self-serving Bias
The common human tendency to attribute positive events to one's own character but attribute negative events to external factors.
Environmental Cause
A factor in the surrounding environment that contributes to the development or outcome of a condition or event.
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