Скачать или смотреть Locomotion in Protists| Locomotion in Euglena | Locomotion in Peramecium | Locomotion in Amoeba

#LocomotionInEuglena
#LocomotionInParamecium
#LocomotionInAmeoba
#fscbiology
#Irtisamsbiology
Euglena moves with the help of flagellum. As the flagellum is whipped backward, the organism moves forward. Nevertheless, when the flagellum moves forward Euglena does stagnate backward. Locomotoryflagellum is at the anterior end of the body and pulls the organism forward. Waves of activity are produced by the flagellum itself, and they pass in a spiral style from its base to its tip.
They increase amplitude and velocity. The activity note of the flagellum triggers the body of Euglena to turn forward about its axis. Euglena has the ability to change its direction by the active contractile myonemes which run along the length of its body. When they contract the shape of the body as well as its direction changes. First, the body becomes short and wider at the anterior end than in the center and later on at the posterior end. This particular movement is called Euglenoid motion.
Paramecium moves with the help of cilia. This is called the ciliary movement. All the cilia do not move simultaneously, a lot of cilia move in a progressive wave-like way at a time. The wave starts at the anterior end and advances backward. Cilia are short, fine thread-like extensions of the cell membrane. The length of cilia ranges from numerous microns to lots of hundred microns and the size varies from 0.1 to 0.5. µ.
Five out of 9 (5/9) double fibrils contract or slide at the same time with the result that cilium bend or reduce. It is called an effective stroke.
The 4 out of nine (4/9) double fibrils contract and cilium ends up being, straight. It is called a recovery stroke.
In Amoeba movement occurs by means of pseudopodia. The pseudopodia are finger-like projections in the direction of flow of the cytoplasm consequently, the body moves in that direction. The specific system of formation of pseudopodia is still debatable.