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1 BIOLOGY MCQS

Which hormone controls sodium and potassium in the blood?

  • Aldosterone
  • Cortisol
  • Glycogens
  • Pheromones
Correct Answer: A. Aldosterone

Detailed Explanation

Aldosterone is a hormone made by the adrenal glands, which sit on top of the kidneys. Its main job is to control the levels of sodium (Na⁺) and potassium (K⁺) in the blood.


Aldosterone works by telling the kidneys to:




  • Keep sodium in the blood




  • Remove potassium through urine




This balance helps the body maintain normal blood pressure, fluid levels, and electrolyte balance.


Other options do not control sodium and potassium:




  • Cortisol is a stress hormone that helps with metabolism and immune response.




  • Glycogens are stored forms of glucose, not hormones.




  • Pheromones are chemical signals for communication, not for regulating blood minerals.




Maintaining sodium and potassium levels is very important because it affects:




  • Heart function




  • Muscle contractions




  • Nerve signals




In short, Aldosterone is the hormone responsible for keeping sodium and potassium balanced in the blood. It is a key concept in Biology, especially in human physiology and the endocrine system.

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