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Primarily stimulates the beta 1 receptors of the heart which results in an increase in myocardial contractility and heart rate. In addition, it also has some simultaneous effects on both the beta 2 and alpha 1 receptors. The simultaneous stimulation of these two receptors by _______________ results in a cancellation of their individual functions and thus the vascular tone does not change.

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1. Primarily stimulates the beta 1 receptors of the heart which results in an increase in myocardial contractility and heart rate. In addition, it also has some simultaneous effects on both the beta 2 and alpha 1 receptors. The simultaneous stimulation of these two receptors by _______________ results in a cancellation of their individual functions and thus the vascular tone does not change.





 
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