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Question

Adrenaline directly affects on: 
  1. SA node
  2. β - cells of Langerhans
  3. Dorsal root of spinal nerve
  4. Epithelial cells of stomach


Solution

The correct option is A SA node
Adrenalin directly affects the SA node to increase rate of heartbeat. Adrenalin prepares the body for emergency reactions like fight and flight. Thus there is an increase in heart rate, breathing rate, blood pressure, glucose level in blood, peripheral circulation, etc.

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