8. The table below shows the approximate percentage concentration of various components in bloodplasma entering the kidney, glomerular filtrate and urine of a healthy human beingComponent Plasma Glomerular filtrate UrineWater 90 90 94Glucose 0.1 0.10 0.00Amino acids 0.05 0.05 0.00Plasma proteins 8.0 0.00 0.00Urea 0.03 0.03 2.00Inorganic ions 0.72 0.72 1.50(a) Name the process responsible for the formation of glomerular filtrate(b) What process is responsible for the absence of glucose and amino acids in urine?(c) Explain why there are no plasma proteins in the glomerular filtrate?
Question
- The table below shows the approximate percentage concentration of various components in bloodplasma entering the kidney, glomerular filtrate and urine of a healthy human beingComponent Plasma Glomerular filtrate UrineWater 90 90 94Glucose 0.1 0.10 0.00Amino acids 0.05 0.05 0.00Plasma proteins 8.0 0.00 0.00Urea 0.03 0.03 2.00Inorganic ions 0.72 0.72 1.50(a) Name the process responsible for the formation of glomerular filtrate(b) What process is responsible for the absence of glucose and amino acids in urine?(c) Explain why there are no plasma proteins in the glomerular filtrate?
Solution
(a) The process responsible for the formation of glomerular filtrate is called glomerular filtration. This is the first step in the process of urine formation where blood is filtered in the glomerulus of the nephron in the kidney.
(b) The process responsible for the absence of glucose and amino acids in urine is called reabsorption. After filtration, the filtrate passes through the proximal tubule of the nephron where useful substances like glucose and amino acids are reabsorbed back into the blood.
(c) There are no plasma proteins in the glomerular filtrate because these molecules are too large to pass through the filtration membrane in the glomerulus. This membrane allows only small molecules like water, glucose, and ions to pass through, while larger molecules like proteins and blood cells are retained in the blood.
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