Chemical Coordination and Regulation Question 41
41. Adrenaline directly affects on
[2002]
(a) S. A. node
(b) b-cells of Langerhans
(c) dorsal root of spinal cord
(d) epithelial cells of stomach
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Answer : a
Hints & Solutions
(a) Adrenaline is a neurotransmitter that directly acts on the $S$ A node. The hormone adrenaline (epinephrine) is secreted by adrenal medulla. This hormone is primarily responsible for the alarming reactions. It increases the heart rate, breathing blood glucose level. Adrenaline was first hormone to be isolated in crystalline form.
