M1 and M3 Receptors

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Questions and Answers

Which receptors are primarily found in the CNS and exocrine glands?

  • M1 receptors (correct)
  • M3 receptors
  • M2 receptors
  • M4 receptors

Which receptors are found in some exocrine glands, smooth muscle, and endothelium?

  • M3 receptors (correct)
  • M2 receptors
  • M1 receptors
  • M4 receptors

What is the main effect of stimulating M3 receptors?

  • Contraction of smooth muscle (correct)
  • Increased secretions from gastric glands
  • Widely distributed in the brain
  • Increased secretions from salivary glands

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