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Mnemonics, Simplified Concepts & Thoughts

Alpha and Beta Adrenergic Receptors : Mnemonics

Epomedicine, Jun 20, 2023Jun 20, 2023

Last updated on June 20, 2023

Location

Alpha = Arteries and smooth muscles

Beta = Beats or Breaths

Types and Action

1 = Contract

2 = Dilate

Adrenergic receptors
Mnemonic: AB-CD

Receptors

Alpha 1:

  • Vasoconstriction
  • Mydriasis (contraction of iris dilator muscles)
  • Bladder sphincter contraction
  • Uterus contraction

Alpha 2:

  • Smooth muscle dilation
  • Presynaptic terminal inhibition (negative feedback)

Beta 1:

Mnemonic: We have 1 HEART

  • Increase heart rate and contraction

Beta 2:

Mnemonic: We have 2 LUNGS

  • Dilate smooth muscles including bronchioles

Beta 3:

Mnemonic: 3 = Triglyceride

  • Lipolysis
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PGMEE, MRCS, USMLE, MBBS, MD/MS Cardiovascular systemPharmacologyPhysiology

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Comments (2)

  1. Kelvin says:
    Jun 25, 2023 at 7:43 am

    Excellent mnemonics, thank you for teaching and sharing. God bless you ❤️❤️❤️❤️

    Reply
  2. Chanda Kecious says:
    Feb 1, 2024 at 1:00 pm

    You’ve helped a soul🙏🙏

    Reply

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Epomedicine. Alpha and Beta Adrenergic Receptors : Mnemonics [Internet]. Epomedicine; 2023 Jun 20 [cited 2025 May 16]. Available from: https://epomedicine.com/medical-students/alpha-and-beta-adrenergic-receptors-mnemonics/.

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