Glomerular filtration rate is the rate at which fluid is filtered by the kidneys.
The normal rate for humans is 125mL/min or 180L/day. The fluid that is filtered (and not reabsorbed later) is excreted as urine.
protein
Plasma is isotonic to glomerular filtrate, meaning that the concentration of solutes in the two fluids is similar. This isotonicity helps to maintain the balance of fluid and electrolytes in the body.
Protein
Large proteins like albumin are the least likely to be found in the glomerular filtrate, as they are usually too big to pass through the glomerular filtration barrier. On the other hand, small molecules like electrolytes, water, and waste products are more likely to be present in the glomerular filtrate.
the glomerular hydrostatic pressure is the answer
The proximal convoluted tubule reabsorbs the most glomerular filtrate, around 65-70%. This part of the nephron is responsible for reclaiming essential substances like glucose, ions, water, and amino acids from the filtrate back into the bloodstream.
Proteins like albumin, globulins, and fibrinogen are present in plasma but not in glomerular filtrate due to their large molecular size, which prevents them from passing through the glomerular filtration barrier in the kidney.
Both urine and glomerular filtrate contain water, urea, electrolytes (such as sodium and potassium), and creatinine. Glomerular filtrate is the fluid that passes from the blood into the renal tubules, while urine is the final product after further processing and concentration by the kidneys. As glomerular filtrate is modified during its passage through the nephron, some substances are reabsorbed or secreted, leading to differences in composition between the two.
Glomerular filtrate is very similar to blood plasma in terms of composition, as both contain water, ions, nutrients, and waste products. However, glomerular filtrate lacks larger molecules like proteins that are typically retained in the blood due to their size.
Water is present in both urine and glomerular filtrate. Glomerular filtrate is the fluid that is filtered from the blood through the glomeruli in the kidneys, containing water, electrolytes, and small molecules. As this filtrate passes through the renal tubules, water is reabsorbed back into the bloodstream, and the remaining fluid, which becomes urine, contains a lower concentration of water and waste products. Ultimately, urine has a different composition than the original glomerular filtrate due to this selective reabsorption process.
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.
the nephrons produce approx 150 litres of glomerular filtrate per day 99% of which is reabsorbed to leave an average of 1.5litres of urine.