Quiz 3 Flashcards
ADH
causes the reabsorption of water from the renal tubule, secreted from the pituitary
What is the physiological action of the release of aldosterone? What is the stimulus for the release of aldosterone?
low sodium or increase K causes the release of aldosterone. Angiotensin II vasoconstricts and leads to aldosterone release
Describe the renin-angiotensin-aldosterone system (RAAS)
decreased renal perfusion- renin- vasoconstriction and angiotensin- angiotensin I- angiotensin II- vasoconstriction and aldosterone
What happens to the movement of water between body compartments when the serum sodium level is high (hypernatremia)?
water is drawn toward the sodium, blood cells swell
What happens to the movement of water between body compartments when the serum sodium level is low (hyponatremia)?
water is drawn out of the cells, blood cells shrink
The normal serum sodium level is between
135-145
Hyponatremia can be caused by low levels of serum ______________________ or by excessive ___________________ in the intravascular space.
sodium, water
Hypernatremia can be caused by high levels of serum ___________________ or by deficient ___________________ in the intravascular space.
sodium, water
Salt substitutes cannot be given to a patient who has which electrolyte imbalance?
K
The nurse should not administer potassium replacement if the urinary output is
less than 20-30 ml/ hr for 2 hours
Neurological dysfunction is typically caused by alterations in levels of which electrolyte?
Na
Potassium cannot be replaced faster than _________________ mEq/hr
20
Can potassium be replaced intravenously through a peripheral IV?
yes
What is the stimulus for the secretion of the natriuretic hormones?
hypernatremia
What is the physiological response to secretion of the natriuretic hormones?
promotes urinary excretion of sodium and water, decreases BP
