L35 PSL 250 - L35-Fluid Balance Balance Concept The ECF is...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
L35-Fluid Balance Balance Concept The ECF is the pool of available material for cells Input comes from ingestion or metabolic production Output occurs from excretion or consumption Balance must occur over the long run, with input = output Negative Balance Output is greater than input Net reduction in pool concentration Positive Balance Input is greater than output Net increase in pool concentration (Table 14-1) Fluid Balance Balance of H 2 O in the body 60% of the body is H 2 O, with adipose tissue causing variation Plasma 90% water, soft tissues 70-80, bone 22, adipose 10% Intracellular Fluid 2/3 of total body water K+ dominated, with protein (figure 14-2) Extracellular Fluid 1/3 of total body water, Na+ dominated Plasma is 30% of ECF, with protein Interstitial Fluid is 80% of ECF, no protein Minor ECF Components Relatively small volumes: lymph, CSF, saliva, etc. ECF Volume Regulation Regulation of volume needed for long-term BP control Changes in BP cause shifts of fluid between plasma and IF
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Blood Pressure Control Short term, a drop in pressure causes: Auto-transfusion: Movement of fluid from IF to plasma to maintain BP Changes in baroreceptor activity Long term control of volume is balance of thirst/intake and kidney fluid excretion Salt Intake The kidneys need 0.5 g NaCl/day for fluid loss in sweat, feces, intake is 10.5 g NaCl/day, excreted in urine Cl- follow Na+ Salt Excretion Kidneys good at eliminating Na+, but inc. retention inc. BP Must balance 10.5 g/day input
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 5

L35 PSL 250 - L35-Fluid Balance Balance Concept The ECF is...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online