Question

Which of the following statements are correct about Adrenaline

1. Light sensitive and easily oxidised
2. Orally active
3. Potent vasoconstrictor and cardiac stimulant

1. Light sensitive and easily oxidised
2. Orally active
3. Potent vasoconstrictor and cardiac stimulant

• A. 3 only
• B. 1 only
• C. All
• D. 1, 3

Answer 1

Answer:

D. 1, 3

• Adrenaline (epinephrine) degrades rapidly upon exposure to light and air via oxidation, forming adrenochrome (turning the solution pinkish-brown). For this reason, it is always stored in amber-colored or light-protected vials.

• By acting on $\alpha_1$-adrenergic receptors, adrenaline causes potent vasoconstriction (narrowing of blood vessels). By acting on $\beta_1$-adrenergic receptors in the heart, it acts as a strong cardiac stimulant, increasing both heart rate and myocardial contractility.