Drugs Acting on
Autonomic Nervous System
5.1 Which of the following organs is innervated only by parasympathetic nerves:
A. Iris muscles
B. Ciliary muscle
C. Sweat glands
D. Splenic capsule
5.2 The sympathetic and parasympathetic systems exert
functionally opposite influences on the following parameters except:
A. Heart rate
B. Atrial refractory period
C. Pupil diameter
D. Intestinal motility
5.3 Tetrodotoxin blocks nerve impulse/junctional transmission by:
A. Anticholinergic action
B. Depleting acetylcholine
C. Blocking Na+ channels
D. Blocking Ca2+ channels
5.4 The cotransmitter may serve the following function/functions:
A. Regulate the release of the primary transmitter from the nerve ending
B. Alter postjunctional action of the primary
transmitter
C. Itself act as an alternative transmitter
D. All of the above
5.5 The following cotransmitter is most probably involved in mediating nonadrenergic noncholinergic (NANC) relaxation of the gut:
A. Neuropeptide Y (NPY)
B. Adenosine
C. Nitric oxide (NO)
D. Kallidin
5.1 B 5.2 B 5.3 C 5.4 D 5.5 C