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Beta Adrenergic Receptor Types and Function [Beta 1, 2, and 3 Receptor Mechanism of Action]

The different types of beta adrenergic receptors are made easy in this video. Learn where the different beta adrenergic receptors are located and what function they provide. There are 3 main types of beta adrenergic receptors: Beta 1, Beta 2, and Beta 3. Activation of Beta 1 receptors located in the heart leads to increased heart rate, cardiac contraction, and cardiac output which ultimately contributes to an increase in blood pressure. Stimulation of beta 1 receptors in the kidneys leads to renin release and activation of the renin angiotensin aldosterone system to improve blood pressure. Activation of beta 2 receptors leads to smooth muscle relaxation of lungs, blood vessels, GI tract, bladder, and uterus as well as gluconeogensis and glycogenolysis in the liver. Activation of beta 3 receptors leads to fat breakdown in adipose tissue and bladder relaxation. Beta adrenergic receptors are activated by catecholamines, such as norepinephrine and epinephrine, of the sympathetic nervous system. *Edit: At 6:50 it says Beta-1 receptors are primarily located in the heart and lungs. This is meant to say heart and kidneys (lungs are primarily Beta-2). _______________________________ Thanks for watching!