As opposed to an internal skeleton. It refers to the hard shell that covers the outside of the body of mollusks and arthropods. The shell of a mollusk is calcium carbonate secreted from the mantle membrane, while the shell of an arthropod is a cuticle secreted from epithelial cells, and both have in common the fact that they do not contain cells. In addition to supporting the body and functioning as an attachment point for muscles, the exoskeleton also serves to protect against predators. Many arthropods have many joints in their exoskeleton and are highly mobile. However, the exoskeleton is a constraint on growth, so they need to molt. → Related item skeleton Source : Heibonsha Encyclopedia About MyPedia Information |
内骨格に対する。軟体動物や節足動物などの体の外側を包む堅い殻をいう。軟体動物の貝殻は外套(がいとう)膜から分泌される炭酸カルシウム,節足動物は上皮細胞から分泌されるクチクラで,両者とも細胞が含まれていない点で共通。外骨格は体の支持,筋肉の付着部としての機能のほかに,外敵からの保護にも役立っている。節足動物では外骨格に多数の関節をもち,運動性にすぐれたものが多い。しかし,成長にあたって外骨格は制約となるため,脱皮が必要になる。 →関連項目骨格 出典 株式会社平凡社百科事典マイペディアについて 情報 |
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