Within the nephron of the kidney, the descending limb of loop of Henle is the portion of the renal tubule constituting the first part of the loop of Henle. Physiology.
| Substance | Permeability |
|---|---|
| urea | Moderate permeability. |
| water | Highly permeable. Water is readily reabsorbed from the descending limb by osmosis. |
In this way, what does the descending loop of Henle absorb?
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.
Also, why is the descending loop of Henle thinner than the ascending loop of Henle? The thin descending loop is highly permeable to water (which is easily transferred to the interstitium) and less permeable to solutes. On the other hand, the thin ascending limb is highly permeable to sodium but impermeable to water.
Just so, what is the main function of the descending loop of Henle?
This part of the nephron is called the loop of Henle. Its main function is to reabsorb water and sodium chloride from the filtrate. This conserves water for the organism, producing highly concentrated urine.
What leaves the filtrate in the ascending loop of Henle?
Ascending Loop of Henle—Loop Diuretics Fluid entering the loop of Henle is isotonic (osmolarity 300 mOsm/L) but the volume is only a third of the volume originally filtered into Bowman’s capsule. The descending limb of the loop of Henle is permeable to water. Water diffuses into the hyperosmolar medullary interstitium.
14 Related Question Answers Found
Are there aquaporins in the descending loop of Henle?
Aquaporin-1 is not expressed in descending thin limbs of short-loop nephrons. In mammalian kidneys, aquaporin-1 is responsible for water reabsorption along the proximal tubule and is also thought to be involved in the concentration of urine that occurs in the medulla.
What occurs in the loop of Henle?
Loop of Henle. Loop of Henle, long, U-shaped portion of the tubule that conducts urine within each nephron (q.v.) of the kidney of reptiles, birds, and mammals. The principal function of the loop of Henle appears to be the recovery of water and sodium chloride from the urine.
Where is the loop of Henle located?
Answer and Explanation: The loop of Henle is located in the medulla of the kidneys, it is the next step in the renal tubule process after the proximal tubule.
What happens to water in the loop of Henle?
In summary, the loop of Henle is surrounded by tissue fluid which has a high concentration of ions in it. This causes water to move out of the descending limb by osmosis. Because of this concentration gradient ions move into the loop in the thin ascending limb.
Where is the descending loop of Henle?
Descending limb of loop of Henle. Scheme of renal tubule and its vascular supply. (Labeled at center left.) Within the nephron of the kidney, the descending limb of loop of Henle is the portion of the renal tubule constituting the first part of the loop of Henle.
Where is water reabsorbed in the nephron?
The first part of the nephron that is responsible for water reabsorption is the proximal convoluted tubule. Filtered fluid enters the proximal tubule from Bowman’s capsule. Many substances that the body needs, which may have been filtered out of the blood at the glomerulus, are reabsorbed into the body in this segment.
How does the loop of Henle help to conserve water?
Renal conservation of water. The kidney conserves water by first diluting urine as it moves through the loop of Henle and then concentrating urine in the distal tubules and collecting ducts (the latter under the influence of antidiuretic hormone or ADH).
What does the proximal convoluted tubule do?
The proximal tubule efficiently regulates the pH of the filtrate by exchanging hydrogen ions in the interstitium for bicarbonate ions in the filtrate; it is also responsible for secreting organic acids, such as creatinine and other bases, into the filtrate.
What is the main function of the distal convoluted tubule?
Once the filtrate passes through the thick ascending limb of Henle, it enters the distal convoluted tubule, which is a duct of the renal tubule located in the kidney’s cortex that reabsorbs calcium, sodium, and chloride and regulates the pH of urine by secreting protons and absorbing bicarbonate.
What is the function of the Bowman’s capsule?
Bowman’s capsule (or the Bowman capsule, capsula glomeruli, or glomerular capsule) is a cup-like sack at the beginning of the tubular component of a nephron in the mammalian kidney that performs the first step in the filtration of blood to form urine. A glomerulus is enclosed in the sac.
Which statement is true ADH?
Which statement is TRUE regarding antidiuretic hormone (ADH)? ADH increases the permeability of the late distal tubule and cortical collecting ducts to water. Reabsorption of filtered glucose from the filtrate into the cells of the proximal tubule is by: secondary active transport.
Where is the collecting duct located?
The glomerulus and convoluted tubules of the nephron are located in the cortex of the kidney, while the collecting ducts are located in the pyramids of the kidney’s medulla.
What is reabsorbed in the collecting duct?
The collecting duct system is the final component of the kidney to influence the body’s electrolyte and fluid balance. In humans, the system accounts for 4–5% of the kidney’s reabsorption of sodium and 5% of the kidney’s reabsorption of water.
What is reabsorbed in the distal convoluted tubule?
Sodium and potassium levels are controlled by secreting K+ and absorbing Na+. Sodium absorption by the distal tubule is mediated by the hormone aldosterone. Aldosterone increases sodium reabsorption. Sodium and chloride (salt) reabsorption is also mediated by a group of kinases called WNK kinases.