Motion : All living bodies have the characterstic of movement while non living organisms do not move.
Locomotion : Locomotion is defined as walking, swimming, running, crawling, hopping, playing etc. Most of the animals have contractile nature of muscles for movement and locomotion. Every animal has locomotion organs according to his needs.
In cellular animals locomotion is of three types namely (a) amoeboid locomotion (b) cillary locomotion and
(c) flagellar locomotion.
In hydra, locomotion is of six types namely (a) gliding (b) swimming
(c) somersaulting (d) looping (e) cuttle fish type and (f) climbing.
In annelids, locomotion is of every segmant.
Insects have locomotion by legs and appendages. Pterygots are provided with wings which help in flying.
Fishes have locomotion by fins and muscles. Tail also helps fishes in movement.
Amphibians locomotion resembles fishes. Tadpoles and frogs swim in water while they jump on land.
In reptiles locomotion is by creeping legs, snake is an exception. Lizards have cup-like pads which on walls develop vacuum. Due to this, lizard can walk and run over walls.
Birds locomote by wings. Birds have light weight muscles which help in flying.
In mammals locomotion is by muscules and bones. Skeletal system is mainly responsible. Most mammals have two pairs of legs for locomotion.
Locomotion in Man
The movement and locomotion in man is of special type. It resembles with other mammals. Man’s skeleton is made up of many joints. It is covered by muscles. Bones and muscles give shape to the man. Both work together to make man move, walk, run and play. Contraction and relaxation of muscles make man to move and locomote. Both may be voluntary or involuntary. The muscles which are attached to the bones are known as skeletal muscles.
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