5 Questions
Which type of drugs block the action of neurotransmitters at the adrenergic receptors?
Sympatholytic drugs
Which neurotransmitter is primarily released by adrenergic neurons?
Norepinephrine
Which family of receptors are found in the sympathetic nervous system?
α receptors
Which adrenoceptor has a higher affinity for phenylephrine?
α1 receptor
What is the rank order of potency for α-adrenoceptors?
Norepinephrine > isoproterenol > epinephrine
Study Notes
Adrenergic Receptors and Neurotransmitters
- Alpha blockers are a type of drug that block the action of neurotransmitters at adrenergic receptors.
- Norepinephrine (noradrenaline) is the neurotransmitter primarily released by adrenergic neurons.
Adrenoceptors in the Sympathetic Nervous System
- The sympathetic nervous system contains a family of receptors known as adrenoceptors.
Adrenoceptor Affinity and Potency
- The α1 adrenoceptor has a higher affinity for phenylephrine.
- The rank order of potency for α-adrenoceptors is: α1 > α2.
Test your knowledge on adrenergic receptors, drugs that affect them, and the actions, therapeutic uses, and adverse effects of adrenergic agonists and antagonists.
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