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Stack #97614
kidney acid/base homeostasis
| Question | Answer |
|---|---|
| filtration of several substances that affect the ph of body fluids. Name them. | H+, Hco3, co2, H2Po4 and other fixed acids |
| Renal tubules selectively reabsorb and secrete these acids and bases to fine-tune the pH of the | plasma |
| route of filtration of acids/bases that the pH of body fluids takes in renal control of pH | from the glomerular capillaries into the glomerular capsule |
| When the amount of base increases in the body | If the plasma PH is too high, bicarbonate HCo_3 is filtered at the glomerulus but it is not reabsorbed. HCo-3 goes into the urine and is eliminated by the body |
| As HCO-3 (bicarbonate) is eliminated from the body, what happens to the pH of the plasma? | pH decreases, as more base is eliminated acid will increase and pH will decrease |
| When the acid in the body increases, | there are 3 major ways that the kidney tubules regulate the pH of body fluids activate |
| The three major ways that the kidney tubules regulate the pH of the body fluids | Reapsorption of HCo3, generating hco-3 by the kidney tubule cells, secretion of H+ |
| Renal mechanisms for acid/base control are the | slowest, may take hours or days |
| Renal mechanisms for acid/base control allow for elimination of the ________ ________ from the body | fixed acids |
| Fixed acids are | Metabolic acids generated in the body that are elimated in the urine. Carbonic acid is not a fixed acid because it can be elimated via the lungs. |
| when does new bicarbonate become added to the plasma, when the pH increases and new buffering power is added to the plasma | when acid in the body increases |
| three major ways that the kidneys combat acidosis | Conserving (reabsorbing) of HCO3-, generating HCO3-, Secreting H+ |
| The kidneys combat acidosis by conserving (reabsorbing) HCO3- in the _____ | PCT (proximal convoluted tubule) |
| The more co2 in the plasma as in the case of ______ ________ the faster it enters the cell | respirtory acidosis |
| Conserving (reabsorbing) HCO3- | CO2 arrives at the kidney tubule cell in the PCT from the filtrate, or plama, or from metabolic reactions within the cell. |
| With the PCT cell, co2 and h2o form | h2co3 |
| the h2co3 splits into h+ and | and bicoarbonate |
| the H+ moves into the filtrate in exchange for Na+ thru a na+/H+ | antiport system |
| Antiport transport protein | A membrane-bound protein that will transport one substance in one direction in exchange for another specific substance moved in the other direction. |
Created by:
tamiboren
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