Adrenalin has a direct effect on : -

S.A. Node

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cells of Langerhans

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Dorsal root of spinal cord

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Epithelial cells of stomach

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Solution

The correct option is C S.A. Node
The hormone adrenaline (epinephrine) is secreted by the adrenal medulla and directly affects the SA node thereby increasing heart rate. This hormone is responsible for the alarming reactions. It also increases breathing and blood glucose level.

So, the correct answer is 'S.A Node'.

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