Biology Chemical Coordination NUMS 2023
PMDC Verified Question 25 of 50
Under activity of parathyroid glands causes a drop in blood of:
A
\(Mg^{2+}\)
B
\(Na^{+}\)
C
\(K^{+}\)
D
\(Ca^{2+}\)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: \(Ca^{2+}\)
Concept:

The four tiny parathyroid glands on the back of the thyroid are the body's primary calcium regulators.

Solution:

  • They secrete Parathyroid Hormone (PTH), which aggressively extracts calcium from the bones to raise blood calcium levels.


  • If these glands are underactive (hypoparathyroidism), PTH is absent. The bones stop releasing calcium, and the kidneys excrete too much of it, resulting in a dangerous drop in blood calcium ions (\(Ca^{2+}\)).


Why other options are incorrect:

Sodium and potassium balance are regulated by aldosterone from the adrenal glands, not the parathyroids.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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