A) energy producing agent
B) food storage material
C) neuro-transmitter
D) energy storing substances
Correct Answer: C
Solution :
There are four neurotransmitter substances identified in vertebrates, these are acetyle choline, serotonin, adrenoline and nor adrenaline (nor epinephrine). These are collectively called as neurohumors that means these substances are secreted by the nerve cell and stimulate or inhibit activity of other cells. Adrenaline and nor adrenaline are secreted by the axon terminals of the sympathetic post ganglionic fibres which are therefore said to be adrenergic.
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