Tubular maximum (Tm_max) A) is the maximum amount of a substance that the tubular cells can actively transport within a given time period. B) is the maximum rate at which a substance is filtered at the glomerulus. C) occurs when the membrane carrier becomes saturated. D) both (a) and (c) above. E) both (b) and (c) above.

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Quizplus · Accepted Answer

Tubular maximum refers to the maximum amount of a substance that the tubular cells can actively transport within a given time period. This occurs when the membrane carrier becomes saturated with the substance, leading to both active and passive transport mechanisms being unable to transport any more of the substance. Therefore, Tm_max depends on the maximum transport capacity of the tubular cells and carrier saturation.

Tubular Maximum (Tmmax)

Tubular Maximum (Tm_max)