Renal compensation

Kidneys within the human body, where renal compensation takes place.

Renal compensation is a mechanism by which the kidneys can regulate the plasma pH. It is slower than respiratory compensation, but has a greater ability to restore normal values. Kidneys maintain the acid-base balance through two mechanisms: (1) the secretion of H+ ions into the urine (from the blood) and (2) the reabsorption of bicarbonate HCO−
3 (i.e., bicarbonate moves from urine back into the blood).[1] The regulation of H+ ions and bicarbonate HCO−
3 is determined by the concentration of the two released within the urine.[1] These mechanisms of secretion and reabsorption balance the pH of the bloodstream.[1] A restored acid-base balanced bloodstream thus leads to a restored acid-base balance throughout the entire body.

Human pH

An ideal pH within the human body ranges from 7.35 to 7.45.[2] When the pH of the body falls below 7.35, an acidemia occurs.[2] Similarly, when the pH of the body rises above 7.45, an alkalemia occurs.[2] Renal compensation is one of the many compensatory mechanisms within the body which assist the pH level in ranging between 7.35 and 7.45 as the body cannot function properly when the pH falls out of this range.[2]

Respiratory and renal changes in acid-base elimination typically contrast each other, and respiratory pH disturbances often commence renal compensation.[3] The renal compensation process usually takes a few days to complete as it is dependent upon changes in the reabsorption of bicarbonate.[4] End-staged renal diseases as well as chronic kidney diseases increase the overall risk of individuals developing pneumonia due to the interactions between the kidneys and the lungs.[3] Both organs are targets of similar systematic diseases and loss of normal function of one organ can induce the disregulation of and abnormalities within the other.[citation needed]

Production in the kidneys

In respiratory acidosis, the kidney produces and excretes ammonium (NH4+) and monophosphate, generating bicarbonate in the process while clearing acid. There is also an excretion of Cl- and a reabsorption of sodium, resulting in a negative urinary anion gap.[5]

In respiratory alkalosis, less bicarbonate (HCO3−) is reabsorbed, thus lowering the pH.[citation needed]

References

  1. ^ a b c "Video: Overview of the Role of the Kidneys in Acid-Base Balance". Merck Manuals Professional Edition. Retrieved 2023-04-03.
  2. ^ a b c d Hopkins, Erin; Sanvictores, Terrence; Sharma, Sandeep (2023), "Physiology, Acid Base Balance", StatPearls, Treasure Island (FL): StatPearls Publishing, PMID 29939584, retrieved 2023-04-03
  3. ^ a b Carroll, Robert G. (2007). Elsevier's Integrated Physiology. ISBN 9780323043182. Retrieved 2023-04-03.
  4. ^ Sorino, Claudio; Scichilone, Nicola; Pedone, Claudio; Negri, Stefano; Visca, Dina; Spanevello, Antonio (October 2019). "When kidneys and lungs suffer together". Journal of Nephrology. 32 (5): 699–707. doi:10.1007/s40620-018-00563-1. hdl:10447/375144. ISSN 1724-6059. PMID 30523563. S2CID 202642130.
  5. ^ Ha, Chung Eun; Bhagavan, N. V. (16 June 2015). Essentials of Medical Biochemistry. ISBN 9780124166875. Retrieved 2023-04-03.

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