Multiple choice

Adrenaline directly affects the

  1. islet of langerhans

  2. sinoatrial node

  3. oxyntic cells of stomach

  4. dorsal root ganglia of spinal cord

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Adrenaline (epinephrine) directly stimulates the sinoatrial (SA) node, increasing heart rate and cardiac output. It binds to beta-1 adrenergic receptors on SA node cells, enhancing the rate of depolarization and firing frequency.