Q. Define Neural and Neurotransmitter Control?
Coronary arteries are richly innervated by adrenergic and parasympathetic nerves. Both alpha 1 and alpha 2 adrenergic receptors are present in coronary arteries and when activated by circulating norepinephine causes vasoconstriction, which appears to be mediated by an increased concentration of Ca++ in coronary vascular smooth muscle. Beta 2 adrenoceptors in the large and small coronary arteries mediate vasodilation