Dr Gawad Physiology Course Online Exams - Parasympathetic Nervous System, Chemical Transmitters
13 MCQs (Only one correct answer)Each MCQ: 1 mark, Total mark: 13 (you will get the results immediately with correction by the web)Allowed time: 16 minGood Luck
- 1.About the vagus nerve, all the following is true except:
- A.
(A) It contains afferent and efferent fibres.
- B.
(B) It contains parasympathetic pregang fibres.
- C.
(C) It produces micturition.
- D.
(D) It causes increased peristaltic movement of the intestinal wall.
- 2.Stimulation of the pelvic nerve (sacral autonomic) produces :
- A.
(A) Relaxation of the wall of rectum and contraction of the internal anal sphincter.
- B.
(B) V.C. of the blood vessels in the external genitalia causing erection of penis.
- C.
(C) Contraction of the bladder wall and relaxation of the internal urethral sphincter.
- D.
(D) Contraction of smooth muscles in the male sexual passages causing ejaculation.
- E.
(E) Relaxation of the external urethral and anal sphincters.
- 3.Concerning the pelvic nerve, all the following is true except:
- A.
(A) It is the nerve of erection (= nervus erigenes).
- B.
(B) It is motor to the urinary bladder and distal half of the large intestine.
- C.
(C) It is inhibitory to both the internal anal and urethral sphincters.
- D.
(D) It has no postganglionic nerve fibres.
- 4.The parasympathetic nerves :
- A.
(A) Are important in emergency conditions.
- B.
(B) Play important functions in the skin and skeletal muscles.
- C.
(C) Tend to have longer postganglionic fibres than pregang fibres.
- D.
(D) Are catabolic in their actions.
- E.
(E) Mainly exert opposite effects to those of the sympathetic nerves.
- 5.An injury to the first 4 sacral segments of the spinal cord produces :
- A.
(A) Hyperglycaemia.
- B.
(B) V.D. in the cutaneous blood vessels.
- C.
(C) Disturbance of sweat secretion.
- D.
(D) Lack of erection of the penis in males and clitoris in females.
- E.
(E) Relaxation of the internal anal and urethral sphincters.
- 6.The functions of Parasympathetic innervations to the salivary glands is:
- A.
(A) V. C. and secretion.
- B.
(B) V.D. and secretion.
- C.
(C) V.D. and inhibition of secretion.
- D.
(D) Secretion of scanty viscous saliva.
- 7.Which of the following may be produced by parasympathetic stimulation:
- A.
(A) Acceleration of the heart.
- B.
(B) Relaxation of the GIT wall
- C.
(C) V.D. of coronary artery.
- D.
(D) Dilatation of the pupil.
- E.
(E) Contraction of the urinary bladder wall.
- 8.About acetylcholine, all the following is true except:
- A.
(A) It is synthesized & released by some sympath postgang nerve fibres.
- B.
(B) It is the chemical transmitter released by all pregang nerve fibres.
- C.
(C) It is not related to accommodation
- D.
(D) It is liberated by all parasympathetic postganglionic nerve fibres.
- 9.All the following statements are correct except :
- A.
(A) Stimulation of the greater splanchnic nerve causes adrenomedullary secretion
- B.
(B) Acetylcholine is normally present at low concentrations in the blood.
- C.
(C) Intravenous injection of acetylcholine does not cause exactly the same effects as parasympathetic stimulation.
- D.
(D) The dilator pupillae muscle contains alpha adrenergic receptors.
- E.
(E) Stimulation of the postganglionic nerve fibres arising from the collateral ganglia causes secretion from the adrenal (suprarenal) medulla.
- 10.The nicotine-like action of acetylcholine is present in :
- A.
(A) All preganglionic nerve endings.
- B.
(B) The sympathetic postganglionic supply to the blood vessels in skeletal muscles.
- C.
(C) The parasympathetic postganglionic supply to the heart.
- D.
(D) The sympathetic postganglionic supply to the sweat glands.
- E.
(E) The parasympathetic postganglionic supply to the GIT.
- 11.The alpha adrenergic receptors :
- A.
(A) Are not stimulated by epinephrine.
- B.
(B) When stimulated they reduce the gastrointestinal motility.
- C.
(C) Are blocked by propranolol.
- D.
(D) increase heart rate.
- 12.A drug which blocks the beta adrenergic receptors causes :
- A.
(A) Dilatation of the bronchial muscle.
- B.
(B) Relaxation of the sphincters in the alimentary canal.
- C.
(C) Fall in the cardiac output.
- D.
(D) None of the above
- 13.The alpha adrenergic receptors mediate all the following except :
- A.
(A) Vasoconstriction.
- B.
(B) Pupil dilatation.
- C.
(C) Spleen contraction.
- D.
(D) Relaxation of intestinal wall.
- E.
(E) increased cardiac activity.
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