Body water interactions

% Of body water

45 -75% depending on adipose tissue

Standard values

21 y/o | 70 kg | 60% body water

Newborn BWP

75 %

W vs M BWP

Body water and sex

Hormones (Estrogen) encourages fat to accumulate in breast and buttocks

W vs M BWP

Body water and age

Decreases because muscle becomes connective tissue

Why know BWP?

To administer the right amount of medication and know its final concentration in the body

How is BW in dynamic constancy?

1. Me vs the outside

2. Internally

Me vs the outside =?

Intake vs Output

Ex. of intakes

Oral fluid/intake as food and oxydative water (RC)

Ex. of insensible outputs

From lungs (exhales) and skin (insensible perspiration)

Ex. of sensible outputs

From kidneys and gastrointestinal track (urine, feces) AND sweat

Facultative vs Obligatory loss

Necessary to maintain balance vs Required

Sensible vs Insensible output

Aware vs unaware of the loss

Kidney

Key homeostatic organ for water balance

How is a facultative loss eliminated?

By the kidneys

3/4 % vs 10% in water turnover

Less water turnover bc the water molecules have to travel farther to reach skin/lungs(output) + surface/weight and underdeveloped kidneys for babies