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Pacemaker of Heart

Adrenaline di...

Question

Adrenaline directly affects _____.

A

S.A. node

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B

B-cells of Langerhans

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C

Dorsal root of spinal nerve

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D

Epithelial cells of stomach.

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Solution

The correct option is A
S.A. node

Adrenaline directly affects the SA node to increase the rate of heartbeat. It prepares the body for emergency reactions like fight & flight. Thus, there is an increase in heart rate, breathing rate, blood pressure, glucose level in blood, peripheral circulation, etc. (3-cells of islet of Langerhans secrete insulin that lower blood glucose level). Secretion of digestive juice by epithelial cells of the stomach is inhibited during this time.

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