Parasympathetic receptors

M1 receptors -------------- q

---  CNS

---  enteric NS

M2 receptors ---------- i 

--- decrease HR

--- decrease contractility of atria

M3 receptors   ----------- q

- increase exocrine gland secretion

---increase gut peristalsis

----increase bladder contraction

-- miosis

---bronchoconstriction

---ciliary muscle contruction (accomodation)