Dr John Campbell
@campbellteaching·3.3M subscribers·3.1K videos
Pupils and light
Posted
December 2, 2016
Views
28,882
Likes
133
Comments
10
Engagement
0.50%
December 2, 2016
28,882
133
10
0.50%
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9:33Now PlayingPupils may constrict or dilaate, this is acheived by constriction and dilatin of the iris and the smooth muscles it contains.
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