NFS382H1 Lecture 7: Lecture 7 Hypertension and Microminerals
11 Apr 2012
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Sodium: major source: added nacl, salt free = <5mg nacl/serving. Reduced salt/less salt: 25%+ less nacl/serving than reference. Sodium absorption, transport: most is absorbed, little excreted in feces, bbm, na/glucose cotransporters in si, na/cl cotransporters in si, colon, na absorption in colon. Sodium function: serum na, k, cl narrow range (electrolyte balance); maintain osmotic pressure, fluid balance, nerve transmission, muscle contraction (ap, na: extracellular cation. Blood pressure: force blood exerts against walls of blood vessels, measured mmhg: e. g. 124/84 (systolic/diastolic pressure: systolic: heart beats, pumps blood, diastolic: heart relaxes, fills with blood, decrease in blood pressure by 10/5mmhg has benefits: decreased heart, normal blood pressure. Kidney disease/diabetes <130/80 failure, stroke, heart attack, death. Increased na/decreased renal na excretion/increased na reabsorption nacl/h20 retention increased plasma volume increased blood pressure. Na interferes with blood vessel smooth muscle activity, promotes muscle contraction. Potassium: major intracellular cation, unprocessed foods: bananas, mango, papaya, leafy greens, etc, k diffusion channels in blm of enterocytes.
