Question

Adrenaline directly affects

• A. S.A. node
• B. B-cells of Langerhans
• C. Dorsal root of spinal nerve
• D. Epithelial cells of stomach.

Answer 1

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, the glucose level in blood, peripheral circulation, etc. The endocrine pancreas consists of ‘Islets of Langerhans’. Beta-cells of Islet of Langerhans secrete insulin that lowers blood glucose level. Secretion of digestive juice by epithelial cells of the stomach is inhibited during this time.