True statements about the following neurotransmitters include:
a. dopamine is formed from tyrosine
b. in the synapse, noradrenaline is inactivated by active reuptake into the presynpatic terminals
c. noradrenaline is formed by hydroxylation of dopamine
d. all above
a. dopamine is formed from tyrosine
b. in the synapse, noradrenaline is inactivated by active reuptake into the presynpatic terminals
c. noradrenaline is formed by hydroxylation of dopamine
d. all above