Chapter 25 My Labs Plus
The normal range of blood pH is __________.
7.35-7.45
What would occur if the response to dehydration were regulated by a positive feedback loop rather than a negative feedback loop?
After fluid balance was restored, the response would continue, leading to overhydration and other electrolyte and pH imbalances.
Which of the following substances is the most acidic?
Gastric juice with a pH of 2
CO2 + H2O ↔ H2CO3 ↔ __________
H+ + HCO3−
Which of the following ions is found primarily in the ECF?
HCO3-
If you double the total amount of Na ions, but you also double the amount of water they are dissolved in, __________.
Na ion concentration will stay the same
Calcium ion reabsorption in the kidneys is stimulated by the hormone __________.
PTH
How would drugs such as ACE (angiotensin-converting enzyme) inhibitors affect the response of dehydration?
Response to dehydration begins with angiotensin-II so inhibiting it will hinder the body's ability to respond properly when dehydrated.
A nurse is asked to start an intravenous line of isotonic 0.9% sodium chloride. He accidentally grabs a bag of hypertonic 9% sodium chloride instead. What will happen to his patient?
The patient's cells will shrivel due to losing water by osmosis from the cytosol into the hypertonic extracellular fluid.
The hormone PTH causes __________.
a decrease in the reabsorption of phosphate ions
Substances that function to resist large swings in pH are called __________.
buffers
Overhydration will cause __________.
cells to gain water
A patient present with severe metabolic alkalosis. The appropriate respiratory compensation would be __________.
decreased respiratory rate
Which of the following is not an electrolyte?
glucose
The appropriate response to hyponatremia is __________.
increased reabsorption of sodium ions in the kidneys
Increased water volume causes the hydrostatic pressure in plasma to increase and the osmotic pressure to decrease; as a result, water will __________.
move from the ECF to the ICF
If the Pco2 in the plasma increases, what effect will this have on plasma pH?
the pH will decrease
