2S [LEC]: Electrolytes Flashcards
Ions capable of carrying electric charge
Electrolytes
A substance that dissociates into ions in solution and acquires the capacity to conduct electricity
Electrolytes
Which electrolytes are responsible in volume and osmotic regulation?
i. Na
ii. Mg
iii. PO4
iv. K
v. Cl
vi. Ca
i, iv, v
Which electrolytes are responsible in myocardial rhythm and contractility?
i. Na
ii. Mg
iii. PO4
iv. K
v. Cl
vi. Ca
iv, ii, vi
Which electrolytes can act as cofactors in enzyme activation?
i. Na
ii. Mg
iii. Zn
iv. K
v. Cl
vi. Ca
ii, iii, vi (pwede rin ang Cl for amylase)
Electrolyte responsible in the regulation of ATPase ion pumps
Mg
Electrolytes responsible in acid-base balance
i. Na
ii. Mg
iii. PO4
iv. K
v. Cl
vi. Ca
i, iv, v
Electrolytes responsible in blood coagulation
i. Na
ii. Mg
iii. PO4
iv. K
v. Cl
vi. Ca
ii, vi
Electrolytes responsible in neuromuscular excitability
i. Na
ii. Mg
iii. PO4
iv. K
v. Cl
vi. Ca
ii, iv, vi
Major extracellular cation
Na
Osmolality active cation
Na
Electrolyte that is used as a treatment for arrythmia
Ca
Electrolytes that are used a cofactors for ALP
Mn, Mg
Also known as coagulation factor IV
Ca
Electrolyte cofactor of amylase
Ca, Cl
How many Na molecules are pumped out as the ATP is converted into ADP?
3
How many K molecules are pumped in as the ATP is converted into ADP?
2
Level of K in acidosis
High
Level of K in alkalosis
Low
Electrolyte responsible for the production and use of ATP from glucose
Mg
How many percent of the total body weight is water?
40-75%
How much of the plasma is water?
93%
Physical property of solution that is based on concentration of solutes
Osmolality
Most osmometers use which colligative properties?
Freezing point depression
Vapor pressure
Physiological response the regulates osmolality
Thirst
Secretion of AVP
Major hormone systems that contribute to the regulation of fluid and electrolyte balance in the body
AVP/ ADH (for water retention)
RAAS (for sodium retention)
Increases tubule permeability to water so more is reabsorbed into the circulation
Arginine vasopressin (AVP) hormone
Regulates total concentration of blood through water balance
Arginine vasopressin (AVP) hormone
Parts of the nephron that are responsible for water reabsorption
Distal convoluted tubule
Collecting duct
How much osmolality increase is needed to trigger the hypothalamus to produce AVP?
1-2%
How much AVP is produced when the hypothalamus is triggered due to increased osmolality
4-fold increase
Released from the myocardial atria and promotes sodium excretion in the kidney
Atrial natriuretic peptide (ANP)
Where is the brain natriuretic peptide found?
In the heart
The sodium retention hormone
Aldosterone
Angiotensinogen is synthesized in which organ?
Liver
90% of the extracellular cation
Na
What is the effect of potassium deficiency in sodium level?
Decreased (since K will be conserved and there will be no exchange)
What is the effect of high cholesterol in sodium readings?
Falsely low (if indirect ISE is used)
Colorimetric method used in sodium determination
Suderman & Delory
Reagent used in Suderman & Delory
Zinc uranyl acetate
In flame emission spectrophotometry, what will be the color of chloride?
Intense yellow
In Suderman & Delory method of chloride determination, what is the byproduct of Na precipitation?
Triple salt (sodium magnesium uranyl acetate)
Electrode used in ISE if chloride is being measured
Glass membrane
Primary intracellular cation
Potassium
Which hormone promotes acute entry of potassium into the skeletal muscle and liver by increasing Na, K, ATPase activity?
Insulin
Which catecholamine impairs cellular entry?
Propanolol
Which catecholamine promote cellular entry?
Epinephrine
Exercise increases potassium levels by how much?
0.3 to 1.2 mmol/L
Reference range of potassium
3.5-5.1 mmol/L
Reference range of sodium
135-145 mmol/L
Potassium level in Addison’s disease
Decreased
Effect of insulin overdose in potassium level
Decreased
Colorimetric method of potassium determination
Hoffman
Reagent used in Hoffman colorimetric method of potassium determination
Sodium tetraphenylboron/ Sodium cobaltnitrite
T/F: In Hoffman colorimetric determination of potassium, the blue color is proportional to the K concentration
False (turbidity is proportional to the K concentration)
In flame emission spectrophotometry, what will be the color of potassium?
Violet
Electrode used in ISE if potassium is being measured
Valinomycin
Inner electrolyte solution used in ISE if potassium is being measured
KCl
Reference range of chloride
98-107 mmol/L
Mercurimetric titration method in chloride determination
Schales and schales
In Schales and Schales method of chloride determination, the formation of soluble HgCl is due to excess mercury combining with diphenylcarbazone to form what color?
Blue
What reagent is used in the colorimetric method of chloride determination
Mercuric thiocyanate and ferric nitrate
In the colorimetric method of chloride determination, what color is the formed complex?
Reddish
Electrode used in ISE if chloride is being measured
Silver wire coated with AgCl
2nd most abundant intracellular cation
Mg
Which hormone increases renal reabsorption of Mg and enhances its intestinal absorption?
PTH
Hormones that increase renal excretion of Mg
Aldosterone
Thyroxine
Reference range for Mg
0.63 - 1.0 mmol/L
Colorimetric method of Mg determination based on the production of reddish violet complex
Calmagite
What reagent minimizes the effects of serum proteins in colorimetric method of Mg determination?
Polyvinylpyrrolidone
Most abundant mineral element in the body
Calcium
Hormone stimulated by a decrease in ionized calcium, and suppressed with increased ionized calcium
PTH
Hormone that increases calcium absorption in the intestine
VitD (Cholecalciferol)
Hormone that inhibits the action of both PTH and VitD
Calcitonin
In calcium determination in urine, what is used to acidify the sample?
HCl
Gold standard for vitamin D determination
High Performance Layer Chromatography
Method used in PTH and calcitonin determination
Radioimmunoassay
How many percent of phosphorus is combined with calcium in the bones?
80%
Involved in the intermediary metabolism of the carbohydrate component of nucleosides and ATP
Phosphorus/ Phosphates
Important in structural integrity of cell membrane, surfactant furnishing to the lungs
Phosphorus/ Phosphates
Effect of PTH in phosphate
Decrease (promotes phosphate excretion)
Whic hormone increases intestine absorption and kidney reabsorption of phosphate?
VitD
Which hormone increase tubular reabsorption of phosphate?
Growth hormone
Colorimetric method of phosphate determination that uses TCA filtrate of the specimen
Fiske-Subbarow
In the colorimetric method of phosphate determination, what complex is formed?
Phosphomolybdate complex
In the enzymatic approach of phosphate determination, the phosphate group is incorporated into either ___ or ___ forming the corresponding phosphorylated derivative
Carbohydrate
Nucleoside