Fluid Balance 2 Flashcards
Factors contributing to water distribution
Age
Gender
Body fat
Intravascular water distribution
plasma
Transcellular
Lymph system, joints and eyes
Sodium (solute) concept
Where sodium goes, water flows
Concept of fluid movement between compartments
Higher osmolality
Water goes from an area of lower solute to concentration to area of higher solute concentration
- increase particles= increase osmolatity
Osmolality
Measure of osmoles in a weight kg (solvent)
Osmolarity
measure of the number of osmoles in a volume L solvent
Hydrostatic pressure
pressure of the blood that builds up coming from the capillaries
Oncotic pressure
Osmotic pull from the proteins that remain in the capillary
Albumin
Key plasma protein creating osmotic pull
Key 3 fluid balance regulators
Central Nervous System
Kidneys (renal system)
Heart
Thirst
Hypothalamis osmoreceptors
activated by increase in blood osmolality stimulates thirst centre in hypothalamus- feels thirsty
Kidneys
Controls excretion of water and solutes
Anti- diuretic hormone
Lets bring the urine home
Key first 4 steps in ADH
- Blood osmotic pressure increases
- Sensed by osmoreceptors in hypothalamus
- Stimulates thirst centre
- Sends message to pituitary gland