Lab2: Osmosis & Diffusion Osmosis Diffusion Facilitated Diffusion Active Transport.

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Presentation transcript:

Lab2: Osmosis & Diffusion Osmosis Diffusion Facilitated Diffusion Active Transport

Osmosis: ICF ECFPlasma Membrane Aquaporin 2 Sodium : 4 Water 4 Sodium : 2 Water Unequal Osmolarity; Solute cannot pass membrane

Osmosis ICF (decrease in Cell Volume) ECFPlasma Membrane Aquaporin 2 Sodium : 2 Water 4 Sodium : 4 Water

Diffusion: ICF ECFPlasma Membrane 2 Sodium 6 Sodium Unequal concentrations; Solute can pass membrane or enter ion channel Na Channel + +

Diffusion: ICF ECFPlasma Membrane 4 Sodium Unequal concentrations; Solute can pass membrane Na channel + + Sodium Ions move into cell! + +

Facilitated Diffusion: ICF ECFPlasma Membrane Unequal concentrations; Solute can pass membrane but only through transport proteins; NO ATP! Glucose Transporter

Active Transport: Unequal concentrations; Transport proteins FORCE solute against concentration gradient; ATP required! K want to move out and Na wants to move in via DIFFUSION Na-K ATPase Pump actively transports these ions against their concentration gradient!

Question of the Day A 36-year old patient is having severe abdominal pain with acid reflux & dark bowel movements. The physician orders at colonoscopy/ endoscopy to explore the intestinal tract for suspected ulceration. To prepare for the colonoscopy/endoscopy, the nurse instructs the patient to withhold food for 36 hours prior to the procedure and to purchase and ingest magnesium citrate (MgC 6 H 7 O 6 ) 24 hours prior to the procedure. Why is the patient instructed to take magnesium citrate? Is this solution hyper, hypo or iso-osmotic to the internal environment of the body? Based on the tonicity of this solution what will happen in the digestive tract as the solution of magnesium citrate passes through? Why is the necessary prior to a colonoscopy/endoscopy?