There are at least 3 types of beta receptors surrounded by the body - beta 1, 2, and 3 - and they are sensitive to epinephrine and norepinephrine. beta 1 controls heart rate and force of contraction in the heart (an increase contained by these will increase blood pressure, thus blocking them will lower blood pressure). beta 2 controls smooth muscle many places within the body. beta 3 receptors have smaller amount well defined role contained by fat metabolism.
The deferred American scientist Raymond Ahlqvist suggested already in 1948 that different effects of catecholamines were mediate by different receptors in the target organs, which he call alpha- and beta-receptors. http://nobelprize.org/medicine/laureates.
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