The electrolyte balance in the body is regulated by which organ system?

Appeared in: AIIMS Bhatinda NO - 2019

Explanation

The kidneys are the primary organs for regulating fluid and electrolyte balance.
They accomplish this by filtering blood and selectively reabsorbing necessary substances while excreting waste products and excess ions in the urine.
Key functions include regulating the volume and osmolality of extracellular fluid (ECF), controlling electrolyte levels in the ECF, and maintaining acid-base balance.
Hormones like aldosterone and antidiuretic hormone (ADH) act on the kidneys to fine-tune the retention or excretion of sodium, potassium, and water.

Option B: The heart's primary function is to pump blood, which is necessary for renal perfusion (blood flow to the kidneys), but it does not directly regulate electrolyte concentrations.
Option C: The parathyroid glands have a specific, not general, regulatory role. They secrete parathyroid hormone (PTH), which primarily controls the balance of calcium and phosphate in the blood.
Option D: The liver performs many vital metabolic functions, such as producing albumin which helps maintain osmotic pressure, but it is not the primary organ for regulating the concentration of electrolytes like sodium and potassium.

Clinical Relevance

Nursing practice connection: Knowing Regulation of electrolyte balance helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses are responsible for monitoring a patient's fluid intake and urine output, as well as laboratory results for serum electrolytes (e.g., sodium, potassium, calcium). These are key indicators of renal function.
In conditions like Chronic Kidney Disease (CKD) or Acute Kidney Injury (AKI), the kidneys lose their ability to regulate electrolytes, leading to life-threatening imbalances such as hyperkalemia (high potassium), which can cause cardiac arrest.
Patient education often involves dietary restrictions (e.g., low sodium, low potassium) to reduce the workload on compromised kidneys.

How to Approach the Question

First, identify the core concept of the question, which is the regulation of 'electrolyte balance'.
This is a factual recall question that asks for the primary organ system responsible for a major physiological function.
Consider the main function of each organ listed in the options.
The heart is a pump.
The parathyroid glands are endocrine glands with a specific function (calcium/phosphate regulation).
The liver is a metabolic powerhouse.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor p. 774-776

E6 Nursing Brunner Adult Health 3SA Vol 1 Part 1 p. 137-139

E6 Physiology Guyton 4SAE Part 2B p. 58-59

Practise the full AIIMS Bhatinda NO - 2019

Attempt every question from this paper in a timed mock, then review the full solution for each one.