In myasthenia gravis:
a. the vertical muscles of the eye are more commonly involved than the horizontal muscles
b. the pupil reaction to light is sluggish
c. absent antibody to acetylcholine receptors exclude the diagnosis
d. Cogan's twitch refers to involuntary twitching of the orbicularis
a. the vertical muscles of the eye are more commonly involved than the horizontal muscles
b. the pupil reaction to light is sluggish
c. absent antibody to acetylcholine receptors exclude the diagnosis
d. Cogan's twitch refers to involuntary twitching of the orbicularis