Are structures made of muscles arranged in a circular manner
that regulate the passage of something from one part of the body to
another. *
O
Sphincter
Pharyngeal
O
Trachea
Peristalsis

Brian has a medical condition called cone dystrophy, which is a disorder of the cone cells in the eye. what symptoms would you expect brian to have? a. inability to see in the dark b. difficulty determining colors c. difficulty determining shapes and outlines d. inability to see in all light conditions