How does norepinephrine act on B1 receptors when it can only act on ALPHA adrenoreceptors?

StrongBeliever

2+ Year Member
Oct 7, 2016
36
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Status
Medical Student
So, I know that epinepherine acts on both ALPHA and BETA adrenorecptors.
But, norepeniphrine acts only on ALPHA adrenoreceptors.

Then in my other book it says, in the pacemaker of the heart, sympathetic releases noradrenaline (norepinephrine) and acts on B1 receptor of the heart. But why??
 
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