Explain ciliary movement. (5 marks). (8th std level)
Answers
Answer:
The study of flagellar and ciliary movement over the last 50 or more years has revealed the basic features of its mechanism. It is now known that dynein is not a simple force-generating motor: by responding to the mechanical signal associated with flagellar bending, it can dynamically switch its functional mode from the inactive cross-bridging state to the active sliding state in the presence of constant, physiologically high, concentrations of ATP. The different modes of dynein functions are determined by the position in the 9+2 structure as well as by the phase of beating: the central-pair microtubules are responsible for determining dynein activity and the dyneins in the plane of the central pair behave differently from those in the beat plane that is perpendicular to the central pair plane.
What is Ciliary Movement?
This type of movement occurs in most of our internal tubular organs.It includes the ciliated epithelium. The coordinated movements of cilia in the trachea help us in removing dust particles inhaled along with the atmospheric air. Also the passage of ova through the female reproductive tract is also performed by ciliary movement.