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CO2/H(+) sensing: peripheral and central chemoreception.

Sukhamay Lahiri1, Robert E Forster

  • 1Department of Physiology, University of Pennsylvania Medical Center, Richards Building, Philadelphia, PA 19104, USA. lahiri@mail.med.uoenn.edu

The International Journal of Biochemistry & Cell Biology
|June 24, 2003
PubMed
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The body maintains constant hydrogen ion (H+) levels through coordinated respiratory and renal systems. Specialized CO2/H+ sensors detect changes, ensuring internal chemical equilibrium essential for homeostasis.

Area of Science:

  • Physiology
  • Biochemistry
  • Homeostasis

Background:

  • The principle of

Purpose of the Study:

  • To explore the mechanisms of hydrogen ion (H+) regulation in the internal environment.
  • To detail the roles of respiratory and renal systems in maintaining acid-base balance.
  • To examine CO2/H+ sensing mechanisms and their integration in physiological regulation.

Main Methods:

  • Review of chemoreceptor functions (carotid, aortic, medullary) in sensing arterial and CNS P(O2) and H+.
  • Detailed explanation of cellular CO2 reactions, carbonic anhydrase, and the Jacobs-Stewart Cycle.
  • Analysis of acclimatization to high altitude, including peripheral chemoreceptor stimulation and hypoxia-inducible factor (HIF-1).

Related Experiment Videos

Main Results:

  • Respiratory and renal systems jointly regulate [H+], with rapid adjustments by ventilation and slower regulation by the kidney.
  • Peripheral and central chemoreceptors play distinct roles in sensing H+ and P(O2), influencing ventilation.
  • High altitude acclimatization involves complex interactions between O2 sensitivity, ventilation, and pH regulation, with HIF-1 stabilization.

Conclusions:

  • The constancy of the internal environment, particularly [H+], is maintained through sophisticated CO2/H+ sensor-receptor systems.
  • Understanding these mechanisms is crucial for comprehending physiological responses to environmental changes and metabolic disturbances.
  • This review synthesizes recent findings on CO2/H+ sensing, highlighting its fundamental role in homeostasis.