Question

Adrenaline directly affects on :-

• A. $S. A.$ node
• B. $\beta$-cells of Langerhans
• C. Dorsal root of spinal cord
• D. Epithelial cells of stomach

Answer 1

Answer: (A)

$S. A.$ node

Answer 2

Adrenaline prepares the body for emergency reactions like fight and flight. Therefore, it directly affects the $SA$ node to increase the rate of heart beat.