Book contents
- Thirst and Body Fluid Regulation
- Thirst and Body Fluid Regulation
- Copyright page
- Contents
- Figures
- Preface
- 1 Fundamentals of Thirst and Body Fluid Regulation
- 2 Body Fluid Compartments, Inputs, and Outputs
- 3 Intracellular Dehydration Thirst and Drinking
- 4 Intracellular Dehydration: Mechanism
- 5 Extracellular Dehydration Thirst and Drinking
- 6 Pregnancy and the Ontogeny of Thirst
- 7 Food-Associated Drinking and Nycthemeral Rhythms
- 8 Hybrid Dehydrations: Water Deprivation
- 9 Hybrid Dehydrations: Thermal Stress and Exercise
- 10 Thirst in Aging and Clinical Populations
- 11 Comparative Aspects of Body Fluid Regulation
- Appendix Methods in Physiology and Neuroscience
- References
- Index
3 - Intracellular Dehydration Thirst and Drinking
Published online by Cambridge University Press: 09 December 2021
- Thirst and Body Fluid Regulation
- Thirst and Body Fluid Regulation
- Copyright page
- Contents
- Figures
- Preface
- 1 Fundamentals of Thirst and Body Fluid Regulation
- 2 Body Fluid Compartments, Inputs, and Outputs
- 3 Intracellular Dehydration Thirst and Drinking
- 4 Intracellular Dehydration: Mechanism
- 5 Extracellular Dehydration Thirst and Drinking
- 6 Pregnancy and the Ontogeny of Thirst
- 7 Food-Associated Drinking and Nycthemeral Rhythms
- 8 Hybrid Dehydrations: Water Deprivation
- 9 Hybrid Dehydrations: Thermal Stress and Exercise
- 10 Thirst in Aging and Clinical Populations
- 11 Comparative Aspects of Body Fluid Regulation
- Appendix Methods in Physiology and Neuroscience
- References
- Index
Summary
Injection of solutes such as Na+ or mannitol, which initially elevate ECF osmotic pressure and then draw water from cells to dilute the load to near isotonicity, causes reliable drinking in all species studied. This osmoregulatory drinking is accompanied by report of thirst in humans and secretion of AVP. The threshold elevation of systemic osmolality to initiate these changes is in the range 1–3%. Regardless of whether drinking is allowed, the osmotic load is excreted by the kidney over the course of2–4 hours. From sham drinking and other studies, osmoregulatory drinking is satiated when osmotic pressure is normalized and cellular water is restored. Many studies have shown that osmoreceptors for drinking and AVP secretion are located in or near the CVOs of the lamina terminalis. In addition, peripheral osmoreceptors in the gut or splanchnic regions monitor the osmolality of fluids absorbed from the gut and are sufficient to stimulate drinking in the absence of systemic hyperosmolality.
- Type
- Chapter
- Information
- Thirst and Body Fluid RegulationFrom Nephron to Neuron, pp. 31 - 49Publisher: Cambridge University PressPrint publication year: 2021