What Type of Receptors Do Norepinephrine and Epinephrine Bind in the Heart

Question

What type of receptors do norepinephrine and epinephrine bind in the heart?
A) 1-adrenergic
B)  -adrenergic
C)muscarinic
D)nicotinic

Accepted Answer

Norepinephrine and epinephrine bind to beta-adrenergic receptors in the heart, specifically beta-1 adrenergic receptors, which increase heart rate and contractility.