Dehydration

Dehydration - deficits – regulated by plasma tonicity and...

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Dehydration . the process of reducing body water either through illness, physical exertion, thermal stress, or water deprivation
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Defense mechanisms mediated by antidiuretic hormone (ADH) reduce water output by the kidney ADH is released during dehydration by signals from blood that reflect the salt concentrations and volume of blood held within the vessels ADH acts on the nephron Physiological Response
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ADH Secretion and Aging Decreased ability of the kidney to conserve water Decreased number of nephrons Nephrons less responsive to ADH Less nephrons + decreased nephron sensitivity to ADH= increased risk of dehydration Physiological Response
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Ability to maintain water balance is dependant on thirst Sensation thought to provide the drive for fluid ingestion Fluid Ingestion Primary drinking Secondary drinking Fluid Ingestion
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Primary drinking driven by deficits in body water and act to restore
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Unformatted text preview: deficits – regulated by plasma tonicity and the volume of blood within the vessels • Secondary drinking – drinking occurs when no apparent need is present Fluid Ingestion • Decrease in thirst following dehydration with aging • Older individuals report lower level of perceived thirst • Therefore there is a lower level of fluid ingestion by older adults Aging Related Changes – Body mechanisms used to regulate body water content are compromised – Capacity to respond to dehydration and retain water is limited – Thirst sensation and drive to replace fluid are reduced – Thirst cannot be used as a reliable indicator of the fluid requirements of older adults Aging Related Changes Thirst cannot be used as a reliable indicator of the fluid requirements of older adults Bottom Line...
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This note was uploaded on 01/19/2012 for the course HPS 3240 taught by Professor Tiffanyesmat during the Spring '12 term at Kennesaw.

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Dehydration - deficits – regulated by plasma tonicity and...

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