Glucose and amino acids are reabsorbed via co-transport with sodium ions, which are actively pumped out of PCT cells. This creates a concentration gradient for sodium to re-enter via facilitated diffusion, carrying glucose and amino acids into the capillaries, followed by water via osmosis.
This card outlines the reabsorption process for glucose and amino acids: sodium ions are actively transported out of PCT cells, lowering their concentration, which facilitates facilitated diffusion of sodium ions back into the cells with co-transported molecules; these then diffuse into capillaries, increasing water potential and leading to water reabsorption by osmosis.
| Front | Stages for reabsorption of glucose and amino acids |
|---|---|
| Back | Sodium potassium pump actively transports sodium ions from cells lining the PCT into capillaries This lowers sodium ion concentration in cells lining the PCT Sodium ions facilitated diffused into cells lining the PCT from the fluid in the PCT Facilitated diffusion involves Co-transport of sodium ions with another molecule from the fluid in the PCT(Chlorine of Vitamins) depending on the carrier molecule The carrier molecule diffuses into the capillaries Reabsorption of sodium ions, amino acids and glucose from the fluid in the PCT increases the water potential of the fluid Water enters the PCT cells from the tubule fluid and is reabsorbed into the blood by osmosis |
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