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Adrenaline directly affects on

1. S. A. node
2. b-cells of Langerhans
3. dorsal root of spinal cord
4. epithelial cells of stomach

Correct answer: S. A. node

Solution

Adrenaline stimulates the heart’s pacemaker, the SA node, through beta-adrenergic receptors, increasing heart rate. The other options are not primary direct targets for this classic sympathetic effect.

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