4 osmosis osmotic 54 osmosis osmotic equilibrium

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: gender Figure 5-25: Distribution of volume in the 25: body fluid compartments body 5.4) Osmosis & Osmotic 5.4) Osmosis Osmotic Equilibrium Equilibrium 1. W ater freely crosses Water membranes membranes 2. Osmotic pressure (mm Hg, atm) Osmotic atm 3. Osmolarity – Molarity x # particles in particles solution/molecule (osm/L) solution/molecule 4. Osmolality – using body wt. – Milliosmoles solute/kg water 5. Comparing two solutions a) Isosmotic (same) b) Hyperosmotic (more) c) Hyposmotic (less) Figure 5-26: Osmosis and osmotic pressure 6 2/2/2010 A. Tonicity: How a Cell A. Tonicity Reacts in a Solution Reacts • Depends on Depends osmolarity, but also osmolarity but permeability of permeability of solutes solutes – = measure of the measure effect on the cell !!! effect • Penetrating solute • Non-penetrating solute ******************** 1) Isotonic cell same 2) Hypertonic cell shrivels 28a, 3) Hypotonic cell swells Figure 5-28a, b: Tonicity depends on the relative concentrations of nonpenetrating solutes nonpenetrating Tonicity: How a Cell Tonicity: Reacts in a Solution Reacts • Penetrating solutes Penetrating can move and disrupt the chemical / osmotic equilibrium!! osmotic Figure 5-28c, d: Tonicity depends 28c, on the relative concentrations of nonpenetrating solutes nonpenetrating 7 2/2/2010 B. Electrical Disequilibrium • Separation of charged ions – Membrane insulates – Potential = stored energy; required to keep charges separate Potential stored – Conduction of signal...
View Full Document

Ask a homework question - tutors are online