NEET 2015 Biology question

A chemical signal that has both endocrine and neural roles is ?

(1)Calcitonin
(2)EpinephrineCorrect
(3)Cortisol
(4)Melatonin

Answer: (2)

Solution

Epinephrine (adrenaline) is secreted by the adrenal medulla into the blood and so acts as a hormone (endocrine role); the same molecule is released at the ends of sympathetic nerve fibres as a neurotransmitter (neural role). NCERT notes

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Question ID VK-091745