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1、ACID/BASE BALANCE,D. C. Mikulecky,ACIDS, BASES AND SALTS,CHEMICAL COMPOUNDS CAN BE PROTON DONORS OR ACCEPTORS PROTON DONORS ARE ACIDS PROTON ACCEPTORS ARE BASES ACIDS AND BASES REACT TO NEUTRALIZE EACH OTHER FORMING SALTS,ACID/BASE REACTIONS,HCl + NaOH NaCl + H2O,ACID + BASE SALT + WATER,ACID/BASE B

2、ALANCE AND THE BLOOD,Acidic,Alkaline (Basic),OH -,H+,Neutral,pH,0,14,7,Acidosis,Alkalosis,Normal 7.35-7.45,Venous Blood,Arterial Blood,6.8,8.0,7.4,DEATH,DEATH,CHEMICAL BUFFER SYSTEMS,H2CO3 HCO3- H+,Na+ Cl-,Add HCl,Na+ Cl-,H+ Cl-,Unbuffered Salt Solution,All protons are free,H2CO3: HCO3- Buffer,Add H

3、Cl,H2CO3 HCO3- + H+,Protons taken up as Carbonic Acid,CHEMICAL BUFFER SYSTEMS,Weak acid/salt systems act as a “sponge” for protons As acidity tends to increase they take protons up As acidity tends to decrease they release protons,CHEMICAL BUFFER SYSTEMS,Carbonic acid/Bicarbonate: Primary buffer aga

4、inst non-carbonic acid changes Proteins: Primary ICF buffer, also ECF Hemoglobin: Primary buffer against carbonic acid changes Phosphate: Urinary buffer, also ICF,ROLE OF RESPIRATORY SYSTEM IN ACID/BASE BALANCE,Alterations in ventilation alter the rate of excretion of carbon dioxide Alterations in t

5、he rate of carbon dioxide excretion cause alterations in pH through carbonic acid This way the respiratory system can help control non-respiratory acidosis and alkalosis,Sources of acidosis,Metabolic: Severe diarrhea, Diabetes mellitus, strenuous exercise, uremia Respiratory: hypoventilation,Sources of alkalosis,Metabolic: Vomiting, ingestion of alkaline drugs Respiratory: hyperventilation,Renal r

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