What types of fluids does your body contain?
What is 2/3 of the obdy's water?
Intracellular fluid (2/3).
interstitial (between cells, intravascular)
intravascular (blood & lymph)
Solutes (floating around in water)
What are the major electrolytes?
Cations: K, Na, Mg, Ca
Anions: P, Cl, SO4-, HCO3- (bicarbonate)
Water balance. What does it control?
What is Osmosis?
Controls the amount of electrolytes in each compartment (blood)?
Osmosis: PASSIVE diffusion of water across membranes (low to high concentration).
Why? For equilibrium.
Water balance. Sodium Potassium pump.
What is the Concentration gradient?
What is required for this process and what is the goal?
C. Gradient: difference in CONCENTRATION of a SOLUTE from one area to another.
*This pump moves ions against the concentration gradient.
: "swap Na+ and K+ across membranes.
Water. What are the functions? (6)
1) Transport of nutrients & O2
2) Misc. body fluids (saliva, bile, etc.)
4) R'qd in some enzyme reactions.
6) Water resists temp. changes
Water needs. What are the factors? (4)
How many cups does the adult male/female need?
What % is water is derived from fluid / food intake?
1) Vary w/ body size
2) Physical Activity
3) Environmental conditions
4) Dietary Intake
*Males: 15 c, Females: 11 c
**80% fluid intake / 20% food intake
How do we excrete water from our body? (4)
: through breathing
Water deficiency. What are some symptoms of DEHYDRATION? (4)
What condition can cause toxicity?
1) Muscle cramps
2) Decreased blood pressure
3) Yellow urine (Not enough H2O)
4) headaches, etc.
1) Anti-diuretic hormone
2) Renin-angiotension & aldosterone system
-Low serum sodium
What does Renin-angiotensin & aldosterone system regulate? (2)
*What increases as you gain water?
1) Water content
2) blood pressure
*Blood pressure increases as you GAIN water.
Is the cause known?
What are the risk factors?
Cause is UNKNOWN.
1) Age - risk increases w/ age
2) Race - African Americans @ highest risk
5) Salt intake (some people)