Part 20 (5/5): Bicarbonate and Hydrogen ions [Substances with Regulated Reabsorption]

Bicarbonate ions (HCO3) are what type of base?

they are weak base

Hydrogen ions (H+) are what type of base?

they are acidic base

Only small amounts of what substances are filtered?

only small amounts of hydrogen ions are filtered

What substance mostly stays in the blood?

hydrogen ions mostly stay in the blood

What substance moves freely across the filtration membrane?

bicarbonate (HCO3) moves freely across the filtration membrane

If bicarbonate (HCO3) is not reabsorbed, what happens to the blood?

the blood becomes too acidic

If blood is in an acidic state, what type of cells reabsorb bicarbonate (HCO3) and excrete hydrogen (H+)?

type A intercalated cells reabsorb bicarbonate and excrete hydrogen

Where are type A intercalated cells found?

they are found in collecting ducts

Type A intercalated cells do what to the urine pH?

they increase urine pH

Type A intercalated cells do what to the blood pH?

they decrease the blood pH

If blood is in an alkaline (basic) state, what cells secrete bicarbonate and reabsorb hydrogen?

type B intercalated cells secrete hydrogen and reabsorb hydrogen

If blood is in an alkaline (basic) state, type B intercalated cells do what to bicarbonate?

they secrete bicarbonate

If blood is in an alkaline (basic) state, type B intercalated cells do what to hydrogen?

they reabsorb hydrogen

Type B intercalated cells do what to blood pH?

they decrease blood pH

Type B intercalated cells do what to urine pH?

they increase urine pH