Which of the following amino acids is involved in the synthesis of nitric oxide, a key molecule in vascular relaxation?

A Arginine ✓
B Lysine
C Glutamine
D Aspartic acid

Explanation

Arginine is a precursor to nitric oxide, which plays a crucial role in vascular relaxation and blood pressure regulation.

Mnemonic

Arginine = Argue (for relaxation) with nitric oxide

Source

Biochemistry by Stryer
Metabolic and Nutritional Disorders Biochemistry Amino Acid Metabolism Hard MEDICAL Confidence: high