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Is cl- reabsorption active or passive?
Chloride (Cl-) reabsorption in the kidneys primarily occurs through passive transport mechanisms, such as facilitated diffusion, often coupled with sodium (Na+) reabsorption. However, it can also involve active transport processes in certain segments of the renal tubule. Overall, while much of Cl- reabsorption is passive, the specific mechanisms can vary depending on the location within the nephron.
Summarize reabsorption in the proximal tubule?
Reabsorption in the proximal tubule involves the passive and active transport of glucose, amino acids, ions, and water from the tubular fluid back into the bloodstream. This reabsorption process helps maintain the body's electrolyte balance and conserve valuable nutrients. It is highly efficient due to the presence of a brush border with microvilli that increases surface area for absorption.
True or false Obligatory water reabsorption involves the movement of water along an osmotic gradient?
True. Obligatory water reabsorption in the kidneys involves the passive movement of water along an osmotic gradient, created by the active reabsorption of solutes like sodium. This process occurs mainly in the proximal convoluted tubule and the descending limb of the loop of Henle.
When the kidneys return salts and water to the blood it is called?
Reabsorption via a process called "secretion".
How does sodium reabsorption affect water reabsorption?
Sodium reabsorption in the kidneys creates an osmotic gradient that drives water reabsorption. As sodium is reabsorbed into the bloodstream, water follows it to maintain the body's electrolyte balance and fluid volume. Therefore, sodium reabsorption directly influences the reabsorption of water in the kidneys.
What aids in the reabsorption of molecules during urine production?
Reabsorption of molecules during urine production is primarily facilitated by the renal tubules, particularly the proximal convoluted tubule, where essential substances like glucose, amino acids, and electrolytes are actively transported back into the bloodstream. Transport proteins and channels in the tubular cell membranes play a crucial role in this process, allowing for selective reabsorption. Additionally, osmosis and diffusion help in the passive movement of water and other solutes, contributing to the concentration and composition of urine. Hormones such as aldosterone and antidiuretic hormone (ADH) also regulate reabsorption processes, ensuring homeostasis.
What happens during tubular reabsorption of drugs?
During tubular secretion, organic ions are actively transported against their concentration gradients. Certain drugs are excreted through the anion transport system of the cation transport system. The coadministration of drugs that inhibit the secretion of any of these transport systems can help increase the half-life of the excreted drug.
What is the process of reabsorption as it occurs in nephrons?
Glucose reabsorption takes place in the proximal renal tubule. This tubule is a portion of the nephron that contains fluid. The functions of the nephron include the reabsorption and secretion of various substances like ions, glucose, and amino acids.
Filtrate reabsorption not under hormonal control is referred to as?
Tubular reabsorption
What is obligatory reabsorption?
the reabsorption of water from pct,alh in nephron which is not influenced by adh.
What regulates water reabsorption in the distal convoluted tubules?
The hormone aldosterone regulates water reabsorption in the distal convoluted tubules. It works by increasing the reabsorption of sodium ions, which in turn triggers the reabsorption of water from the tubules back into the bloodstream.
Why does water follow sodium and not potassium in the human body particularly in the kidney nephrons?
Water follows sodium because of the osmotic gradient created by the reabsorption of sodium in the nephrons. Sodium is actively transported out of the nephron, creating a concentration gradient that drives the passive reabsorption of water. Potassium is reabsorbed in a different segment of the nephron and does not create the same osmotic force to drive water reabsorption.
