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・ Tube (toy)
・ Tube Alloys
・ Tube and clamp scaffold
・ Tube Bar prank calls
・ Tube beading
・ Tube bending
・ Tube caddy
・ Tube chain conveyor
・ Tube Challenge
・ Tube cleaning
・ Tube cleaning (locomotive)
・ Tube dependency
・ Tube designation
・ Tube domain
・ Tube drawing
Tube feet
・ Tube frame
・ Tube furnace
・ Tube Investments of India Limited
・ Tube lemma
・ Tube Lines
・ Tube map
・ Tube Mice
・ Tube Mills railway station
・ Tube Products of India
・ Tube railway
・ Tube riding
・ Tube Slider
・ Tube Snake Boogie
・ Tube socket


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Tube feet : ウィキペディア英語版
Tube feet

Tube feet are the many small tubular projections found on the oral face of a sea star's arms; they are characteristic of the water vascular system of the echinoderm phylum, which also includes sea urchins, sand dollars and sea cucumbers and many other sea creatures.
==Structure and function==
Tube feet function in locomotion, feeding and respiration. The tube feet in a sea star are arranged in grooves along the arms. They operate through hydraulic pressure. They are used to pass food to the oral mouth at the center, and can attach to surfaces. A sea star that is overturned simply turns one arm over and attaches it to a solid surface, and levers itself the right way up.
Tube feet allow these different types of animals to stick to the ocean floor and move very slowly.
Tube feet consist of two parts: ampulla and podia. Ampulla contain both circular muscles and longitudinal muscle, whereas the podia contain the latter only. Thus the podia use suction to attach to the substratum.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Tube feet」の詳細全文を読む



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