What happens at the descending loop of Henle?
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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.
Where is the descending part of the loop of Henle?
(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.
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.
What happens in the proximal tubule of the kidney?
The proximal tubules are a major component of the kidney and are responsible for the reabsorption of the majority of the glomerular ultrafiltrate, along with the reabsorptive or secretory transport of a vast number of solutes regulating the fluid-electrolyte and acid-base regulation of the body.
What is the main function of the descending loop of Henle quizlet?
The loop of henle dips down into the medulla, which is highly salty because of the ion absorption, Sodium is constantly being pumped out of the ascending limb into the medulla. The ascending limb is impermeable to water. The descending limb is permeable to water, but has low permeability to Sodium.
What happens in the proximal convoluted tubule?
The proximal convoluted tubule avidly reabsorbs filtered glucose into the peritubular capillaries so that it is all reabsorbed by the end of the proximal tubule. The mechanism for glucose reabsorption was described in Chapter 7.4. The proximal tubule is the only site for glucose reabsorption.
Is the proximal straight tubule part of the loop of Henle?
Henle’s loop consists of the straight portion of the proximal tubule, the thin descending and (in long loops) thin ascending limbs, and the thick ascending limb (Fig.
Why is the descending loop of Henle thin?
The thin limbs (descending and ascending) are lined by simple squamous epithelium. 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.
Which comes first ascending or descending loop of Henle?
The ascending limb of the loop of Henle is a direct continuation from the descending limb of loop of Henle, and one of the structures in the nephron of the kidney. The ascending limb has a thin and a thick segment. The ascending limb drains urine into the distal convoluted tubule.
How does a proximal tubule compare with a distal tubule?
Proximal tubule has an irregular or star shaped lumen. In contrast, distal tubule has perfectly round lumen. Proximal tubule connects the Bowman’s capsule and nephron loop (loop of Henle), whereas distal tubule connects nephron loop and collecting duct.
What is the main function of the proximal tubule?
The function of the proximal tubule is essentially reabsorption of filtrate in accordance with the needs of homeostasis (equilibrium), whereas the distal part of the nephron and collecting duct are mainly concerned with the detailed regulation of water, electrolyte, and hydrogen-ion balance.
What is the main function of the proximal convoluted tubule?
The proximal convoluted tubule is used for selective re-absorption of glucose, water, peptides and other nutrients from the tubule fluid back into the blood. The cells lining this tubule are ciliated, to ensure maximum surface area for reabsorption.
What is the loop of Henle?
The loop of Henle is a heterogenous segment, comprising the pars recta of the proximal tubule, the thin descending and ascending limbs, and the medullary and cortical thick ascending limbs of the loop of Henle. There is net potassium reabsorption in the loop of Henle and <10% of the filtered load reaches the early distal tubule (see Figure 2 ).
What is the descending loop of the renal tubule?
The descending loop of Henle is the second part of the renal tubule after the proximal convoluted tubule. “Waterfall” is used to remember the physiology of the descending loop of Henle.
Why is the descending loop of Henle called a waterfall?
“Every Waterfall Raises Sodium in Exchange for Potassium to Make Another Waterfall”. The descending loop of Henle is the second part of the renal tubule after the proximal convoluted tubule. “Waterfall” is used to remember the physiology of the descending loop of Henle. Water is reabsorbed as the descending loop falls deeper into the renal medulla.
What is the difference between the U and Henle tubules?
The beginning and end of the U are the proximal and distal convoluted tubules, while the curved portion of the U is the loop of Henle.