Question
A chemical signal that has both endocrine and neural roles is?
-
melatonin
-
calcitionin
-
epinephrine
-
cortisol
Solution
C.
epinephrine
Epinephrine secreted from the medulla of adrenal gland acts as both, an endocrine hormone and as a neurotransmitter (produced at the ends of sympathetic never fibres).
Epinephrine as hormone accelerates metabolic rate for preparing us to face emergency situations.
As neurotransmitter, it transmits nerve impulse across a synaptic left. Calcitonin is released when Ca2+ level increases, melatonin causes concentration of pigment in melanocytes and cortisol is a glucocorticoid.
