These structures are defective in Kartagener's syndrome, leading to its symptom of situs inversus, as they are important in creating the left-right asymmetry of the internal organs during embryonic development.  The outer segments of photoreceptor cells are variants of these
These structures are defective in Kartagener's syndrome, leading to its symptom of situs inversus, as they are important in creating the left-right asymmetry of the internal organs during embryonic development.  The outer segments of photoreceptor cells are variants of these structures. They are responsible for making water currents in clam siphons. Their two actions are power and return strokes, unlike the continuous motion of a similar structure.  These structures are relatively common in the respiratory tract where they help move mucus. For 10 points, name these structures with a characteristic whipping or beating motion that are similar to flagella.
These structures are defective in Kartagener's syndrome, leading to its symptom of situs inversus, as they are important in creating the left-right asymmetry of the internal organs during embryonic development.  
cilia [or cilium]