Catecholamine neurotransmitters

[websie]

Hello people,
Can anyone help me answering this question: adrenaline and noradrenaline are synthesised in and released from the medulla of the adrenal glands into the blood stream. These chemicals also act as neurotransmitters released by sympathetic nerves. Where I get stuck is when it comes to how NA and Adrenaline get into the nerve fibres from the blood (assuming of course, that this is how it works).

Thanks a lot for your help.

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[DrMom]

duplicate thread, so closing.