What is the major extracellular (EC) electrolyte in the body?
Sodium.
Potassium.
Calcium.
Magnesium.
The Correct Answer is A
Sodium is the major extracellular electrolyte in the body.
It is responsible for maintaining the extracellular fluid volume, and also for regulation of the membrane potential of cells.
Sodium is exchanged along with potassium across cell membranes as part of active transport.
Choice B is wrong because potassium is mainly an intracellular ion.
It is important for nerve and muscle function, but it is not the predominant electrolyte in the extracellular fluid.
Choice C is wrong because calcium is not the major electrolyte in the extracellular fluid.
Calcium is mostly found in bones and teeth, where it forms a mineral reserve with phosphate.
Calcium also plays a role in muscle contraction, blood clotting, and enzyme activity.
Choice D is wrong because magnesium is not the major electrolyte in the extracellular fluid.
Magnesium is mostly found in bones, where it helps to stabilize the structure of ATP2.
Magnesium also participates in enzyme reactions, nerve and muscle function, and protein synthesis.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A urinary tract infection (UTI) is a common complication after bladder cancer surgery, especially if the patient has an indwelling urinary catheter.
A UTI can cause symptoms such as fever, pain, burning or urgency when urinating, blood in the urine, or cloudy or foul-smelling urine.
Choice A is wrong because urinary retention (the inability to empty the bladder completely) is unlikely to occur with an indwelling catheter, which drains urine continuously.
Choice B is wrong because urinary incontinence (the loss of bladder control) is more likely to occur after partial or radical cystectomy, which remove part or all of the bladder, respectively.
In these cases, reconstructive surgery is needed to create a new way for urine to leave the body.
Choice D is wrong because urinary urgency (the sudden and strong need to urinate) is also more likely to occur after partial or radical cystectomy, which can affect the nerves and muscles that control urination.
Urinary urgency can also be a symptom of a UTI, but it’s not the only one.
Correct Answer is B
Explanation
An isotonic solution has the same concentration of solutes as the blood plasma. 0.9% sodium chloride solution is an example of an isotonic solution.
It is used to supply water and salt to the body and to prevent hypotension induced by spinal anaesthesia.
Choice A is wrong because a hypotonic solution has a lower concentration of solutes than the blood plasma.
It can cause water to move into the cells and cause them to swell.
Choice C is wrong because a hypertonic solution has a higher concentration of solutes than the blood plasma.
It can cause water to move out of the cells and cause them to shrink.
Choice D is wrong because a colloid solution contains large molecules that do not pass through the capillary walls.
It is used to increase the blood volume and pressure in cases of shock or severe blood loss.
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