When explaining to a CKD client how urea is absorbed, which of the following transport mechanisms will be mentioned?
A) Primary active transport
B) Secondary active transport
C) Passive transport
D) Active sodium transport
Ans: C
Feedback:
The mechanisms of transport across the tubular cell membrane are similar to those of other cell membranes in the body and include active and passive transport mechanisms. Water and urea (a by-product of protein metabolism) are passively absorbed along concentration gradients. Sodium (Na+), other electrolytes, as well as urate, glucose, and amino acids, are reabsorbed using primary or secondary active transport mechanisms to move across the tubular membrane. The bulk of energy used by the kidney is for active sodium transport mechanisms that facilitate sodium reabsorption and cotransport of other electrolytes and substances such as glucose and amino acids.
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