Multiple choice

Adrenaline directly affects ______.

  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, the heart's natural pacemaker, increasing heart rate and contractility. This is part of the 'fight or flight' response. It does not directly affect the islets of Langerhans (pancreatic hormone-producing cells), oxyntic cells (stomach acid-producing), or dorsal root ganglia (sensory nerve clusters).

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