reabsorb

B: As the filtrate travels along the proximal convoluted tubule, sodium is reabsorbed by the cells lining the tubule walls via carbonic anhydrase--an enzyme that produces hydrogen ions which are then exchanged for sodium.

About 25 per cent of sodium is reabsorbed here --this is the key mechanism by which the body can produce urine that is more concentrated than body fluids.

In healthy, nondiabetic individuals, virtually all of the glucose filtered from the plasma by the kidneys is reabsorbed in the proximal tubule, with little to no glucose appearing in the urine.

(6) However, the level of glucosuria does not typically rise in tandem because the capacity of the kidney to reabsorb glucose (ie, Tm glucose) is increased in diabetes, resulting in an increased renal threshold for glucose excretion (~200 to 250 mg/dL).

The fluid becomes more dilute as it moves into the thick ascending limb, which is impermeable to water and urea, but actively reabsorbs NaCl.

Thus, a single tubular structure evolved that secreted or reabsorbed solutes (primarily sodium chloride [NaCl]) and water and opened at one end to the sea, enabling the organism to maintain an internal osmotically favorable environment.

It reabsorbs, and thus, returns to the plasma, up to 100% of the filtered solutes that the body does not routinely wish to discard, such as glucose, amino acids, and bicarbonate and reabsorbs a large percentage of solutes, such as sodium, potassium, chloride, calcium, and magnesium, and water whose amounts of excretion will vary throughout the day.

This meshwork is designed to efficiently pick up water and solutes reabsorbed from the nephron structures.

Once the chemical messengers have done their job, the transmitting neuron reabsorbs them.

Depression may occur when neurons reabsorb too much serotonin too quickly.