The descending loop of Henle receives isotonic (300 mOsm/L) fluid from the proximal convoluted tubule (PCT). The fluid is isotonic because as ions are reabsorbed by the gradient time system, water is also reabsorbed maintaining the osmolarity of the fluid in the PCT.
What is the main function of the descending loop of Henle?
The descending loop contains AQP1 and is therefore permeable to water but impermeable to salt. As urine descends into the medulla, the high interstitial solute concentration osmotically draws water from the descending limb and concentrates salt within the lumen.
What is the main function of the descending loop of Henle quizlet?
What is the major function of the Loop of Henle, Distal Tubule, and
What occurs in the descending limb of the loop of Henle quizlet?
The loop of henle has two parts known as the descending and ascending limbs. … The descending limb is permeable to water, but has low permeability to Sodium. As the filtrate travels down the descending limb the water leaves by osmosis because of the salty environment into the medulla.
What draws water out of the descending limb of the loop of Henle?
As the nephron dips into the medulla in the descending limb of the loop of Henle, water passively diffuses out of the filtrate. … As the filtrate flows down the collecting duct into the renal medulla, the ions in the interstitium act to draw water out of the duct (dependent on the presence of antidiuretic hormone).
What happens in the descending portion of the loop of Henle?
Physiology. The descending loop of Henle receives isotonic (300 mOsm/L) fluid from the proximal convoluted tubule (PCT). … The descending portion of the loop of Henle is extremely permeable to water and is less permeable to ions, therefore water is easily reabsorbed here and solutes are not readily reabsorbed. You may also read,
What is the difference between ascending and descending loop of Henle?
The key difference between ascending and descending loop of Henle is that ascending loop of Henle is the thicker segment of the loop of Henle located just after the sharp bend of the loop while descending loop of Henle is the thinner segment located just before the sharp bend of the loop. Check the answer of
What is the largest component of urine by weight other than water quizlet?
What is the largest component of urine by weight (other than water)? Urea.
Do sodium ions move into the descending limb?
From there, fluid moves to the proximal convoluted tubule, where sodium is actively reabsorbed, along with water due to the osmotic gradient that is present. … In the permeable descending limb, sodium flows in and water flows out, concentrating the amount of sodium ions in the fluid. Read:
Is water reabsorbed in the distal convoluted tubule?
The distal convoluted tubule and collecting ducts
Why is water leaving the thin descending loop?
In summary, the loop of Henle
Where do loop diuretics directly act?
Loop diuretics act predominantly at the apical membrane in the thick ascending limb (TAL) of the loop of Henle, where they compete with Cl– for binding to the Na+/K+/2Cl– cotransporter, thereby inhibiting Na+ and Cl– reabsorption.
Is the descending loop of Henle hypertonic?
The descending limb of the loop of Henle is permeable to water. … NaCl is pumped from the tubule into the interstitium in the ascending limb
What are the three major functions of the loop of Henle?
- Homeostatic mechanisms to regulate the extracellular fluid volume.
- Regulating potassium, calcium and magnesium excretion at the lowest energy costs.
- Homeostasis of the acid-base balance via bicarbonate and ammonia excretion.
- Regulating the composition of urinary protein.
Which parts of the nephron are permeable to water?
The loop of Henle
