In the renal pelvis
Someone with highly concentrated urine may be dehydrated, and fluids may help.
From the original filtrate, a lot of much needed electrolytes (Sodium e.t.c) are reabsorbed (absorbed back into blood), a few substances secreted further into the urine, then loads of water reabsorbed to fine tune body water to exactly how much you need(as much as possible), making urine far more concentrated than the original filtrate.
The water concentration in urine is generally lower than that in glomerular filtrate. During the filtration process in the kidneys, glomerular filtrate contains a high concentration of water, but as it passes through the renal tubules, water is reabsorbed, leading to a more concentrated urine. Therefore, urine typically has a higher concentration of solutes and a lower concentration of water compared to the initial glomerular filtrate.
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Urine is a more concentrated solution than glomerular filtrate because of the reabsorption processes that occur in the renal tubules. As the filtrate passes through the proximal convoluted tubule, loop of Henle, and distal convoluted tubule, water and essential solutes like glucose and ions are reabsorbed back into the bloodstream, while waste products and excess solutes remain in the filtrate. This selective reabsorption leads to a decrease in water content and an increase in solute concentration, resulting in the formation of concentrated urine. Additionally, the collecting ducts can further concentrate urine under the influence of hormones like antidiuretic hormone (ADH).
Compounds found in urine that are typically not present in glomerular filtrate include urea, creatinine, uric acid, and various metabolites. These substances result from metabolic processes and are actively secreted or concentrated by the renal tubules after the initial filtration of blood. Additionally, certain hormones and excess electrolytes may also be present in urine but not in the filtrate.
Typically, summer temperatures cause people to become dehydrated. Dehydrated people produce concentrated urine.
Until the liquid reaches the renal pelvis, it is "glomerular filtrate," when it reaches the pelvis, it is called "urine"
The main difference between filtrate and urine is the chemical composition of the two. Filtrate has almost all the substance that blood plasma has except blood proteins while urine only contains waste substances.
The main difference between filtrate and urine is the chemical composition of the two. Filtrate has almost all the substance that blood plasma has except blood proteins while urine only contains waste substances.
Antidiuretic hormone(ADH) reabsorbs water from the collecting tubules of the kidney causing urine to become concentrated.
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