Acetylcholine Receptors Quiz
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Questions and Answers

What is the main function of nicotinic receptors at the neuromuscular junction?

  • Slowing of heart rate
  • Exocrine gland secretion
  • Transmission of stimulation (correct)
  • Smooth muscle contraction

    • Which subtype of muscarinic receptor is responsible for pupillary constriction in the eye?

  • M4
  • M3 (correct)
  • M2
  • M1

    • What is the main action of the METABOTROPIC M3 RECEPTOR?

  • Promotes contraction (correct)
  • Increases heart rate
  • Reduces cyclic AMP
  • Facilitates calcium release from the endoplasmic reticulum

    • Which neurotransmitter binds to the B1Adrenoreceptor in the heart?

    <p>Noradrenaline</p> Signup and view all the answers

    What is the function of alpha2 adrenergic receptors?

    <p>Inhibition of transmitter release</p> Signup and view all the answers

    What is the role of DAG (diacylglycerol) in the cell?

    <p>Facilitates the opening of calcium channels</p> Signup and view all the answers

    What is the effect of inhibiting ADENYLYL CYCLASE?

    <p>Reduces cyclic AMP</p> Signup and view all the answers

    What is the primary function of beta2 adrenergic receptors?

    <p>Relaxation of smooth muscle</p> Signup and view all the answers

    What initiates the conformational change in the alpha q type of METABOTROPIC M3 RECEPTOR?

    <p>Binding of GTP</p> Signup and view all the answers

    What is the primary effect of calcium on muscle cells?

    <p>Promotes contraction</p> Signup and view all the answers

    What is the function of nicotinic receptors at the adrenal medulla?

    <p>Release of adrenaline and noradrenaline</p> Signup and view all the answers

    Which enzyme does the activated alpha i subunit inhibit?

    <p>Adenylyl cyclase</p> Signup and view all the answers

    Which receptor, when activated by noradrenaline, causes dilation of the eye?

    <p>Alpha 1 adrenoreceptor</p> Signup and view all the answers

    What is the effect of circulating adrenaline on B2 adrenoceptors in the skeletal vasculature bed?

    <p>Vasodilation</p> Signup and view all the answers

    Which receptor activation causes relaxation of the GI tract?

    <p>B2 adrenoceptor</p> Signup and view all the answers

    Which drug acts as a selective beta agonist on bronchiole smooth muscle to produce bronchodilation?

    <p>Salbutamol</p> Signup and view all the answers

    What is the primary use of mirabegron, which acts on beta3 adrenoceptors?

    <p>Treatment of overactive bladder syndrome</p> Signup and view all the answers

    What is the primary purpose of antagonists on beta adrenoceptors?

    <p>Reduction of heart rate</p> Signup and view all the answers

    Which drug acts antagonistically on alpha 1 adrenoceptors on arterioles to produce vasodilation?

    <p>Prazosin</p> Signup and view all the answers

    What is the effect of agonist action on alpha 1 adrenoceptors in the smooth muscle of the prostate and bladder?

    <p>Contraction of the bladder</p> Signup and view all the answers

    What are the side effects of non-selective beta blockers?

    <p>Reduced exercise tolerance</p> Signup and view all the answers

    Which drugs are known as cardio-selective beta blockers?

    <p>Atenolol and metoprolol</p> Signup and view all the answers

    What can result from the abrupt withdrawal of beta blockers?

    <p>Angina</p> Signup and view all the answers

    What is the primary use of tamsulosin, a competitive antagonist on alpha 1 adrenoceptors?

    <p>Treatment of overactive bladder syndrome</p> Signup and view all the answers

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