BODY FLUID BALANCE | PPT

December 21, 2012 | By | Reply More

BODY FLUID BALANCE | PPT

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BODY FLUID BALANCE

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FLUID BALANCE

The Balance Concept: Input -Output = Storage/Depletion

Body Fluid Compartments

Regulation of fluid balance

Relation between Salt Balance and ECF Volume

 

The Balance Concept: Input -Output = Storage/Depletion

Body Fluid Compartments

BODY FLUID COMPARTMENT COMPOSITION

Regulation of fluid balance

ECF Volume: Maintains blood pressure

 

ECF Osmolarity: Prevents swelling or shrinking of cells

ECF Volume: Maintains blood pressure – Short Term

A Change in ECF Volume can raise or lower blood pressure

Barorecepter reflexes:  Alter Cardiac output and Total Peripheral Resistance leading to a compensatory alteration in blood pressure

Fluid automatically shifts between plasma and interstitial fluid with rises or fall in blood pressure

Relation between Salt Balance and ECF Volume

The total sodium load (quantity of sodium, not its concentration) in the ECF determines the total amount  of water that will be osmotically retained

The total sodium load is determined by the balance relation

The Balance Concept: Input -Output = Storage/Depletion

Control of sodium load

Control of amount filtered by regulating GFR (Glomerular Filtration Rate)

 

Control of sodium reabsorption through the Renin-Angiotensin-Aldosterone system

ECF Osmolarity: Prevents swelling or shrinking of cells

ECF hypertonicity is associated with dehydration

 

ECF hypotonicity is associated with overhydration

 

Control of water balance is by thirst and vasopressin

Blood pressure and renal handling of sodium

DAILY WATER BALANCE (LITERS)

FLUID  INTAKE  1.25

 

IN FOOD            1.0

 

METABOLIC        0.35

 

INSENSIBLE       0.9

 

SWEAT               0.1

 

FECES                0.1

 

URINE                1.5

WATER DEFICIT

INCREASED OSMOLARITY SENSED BY HYPOTHALAMIC WATER RECEPTORS

 

FALL IN ECF VOLUME

 

FALL IN ARTERIAL BLOOD PRESSURE

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