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Metoprolol is a beta blocker, or an antagonist of the β-adrenergic receptors. It is specifically a selective antagonist of the β 1-adrenergic receptor and has no intrinsic sympathomimetic activity. [37] Metoprolol exerts its effects by blocking the action of certain neurotransmitters, specifically adrenaline and noradrenaline.
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The β-blockers are an immensely important class of drugs due to their high prevalence of use. The discovery of β-blockers reaches back to more than 100 years ago, when early investigators came up with the idea that catecholamines were binding selectively to receptor-like structures and that this was the cause of their pharmacological actions. [3]
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This means the content of the messages you send and calls you have are private, unlike SMS messages, which are standard text messages of up to 160 characters that are sent using a cellular signal ...
The U.S. believes Chinese intelligence hacked into AT&T, Verizon and Lumen Technologies and gained significant access, including records of phone calls and text messages for many people ...
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