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NEET MDS Quiz - Practice Test

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Physiology - 3 Questions

1
Physiology

The osmolarity of the tubular fluid in the medullary collecting duct is primarily controlled by which hormone?
1) Aldosterone
2) Atrial Natriuretic Peptide (ANP)
3) Antidiuretic Hormone (ADH)
4) Renin

📝 Explanation:

The osmolarity of the tubular fluid in the medullary collecting duct is primarily controlled by Antidiuretic Hormone (ADH), which increases water reabsorption.

2
Physiology

What is the primary function of the Adrenal Medulla in the fight-or-flight response?
1) Secretion of cortisol
2) Secretion of epinephrine and norepinephrine
3) Secretion of aldosterone
4) Secretion of thyroxine

📝 Explanation:

Answer: 2) Secretion of epinephrine and norepinephrine
Explanation: The Adrenal Medulla is part of the sympathetic nervous system and produces the hormones epinephrine (adrenaline) and norepinephrine (noradrenaline) in response to stress or danger. These hormones are crucial for the fight-or-flight response, which prepares the body for immediate action by increasing heart rate, blood pressure, and diverting blood flow to the muscles and brain.

3
Physiology

Which of the following is NOT a secondary bile acid?
1) Cholic acid
2) Deoxycholic acid
3) Lithocholic acid
4) Chenodeoxycholic acid

📝 Explanation:

Cholic acid is NOT a secondary bile acid; it is a primary bile acid synthesized in the liver from cholesterol.

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