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三種類の免疫
物理的・化学的防御・・・体表にはたらく
自然免疫・・・体内にはたらく
獲得免疫・・・体内にはたらく
皮膚・・・表面を覆う表皮と深部の真皮からなる。
表皮の基底層では細胞分裂が盛んに行われており、分裂した細胞は盛んに押し出されながらケラチンというタンパク質を合成し、皮膚の表面で角質層をつくる。
角質層・・・体内の水分が蒸発するのを防ぐ・外界の水分や病原体が体内に侵入するのを防ぐ
皮膚からの分泌物・リゾチームは皮膚表面を弱酸性(ph3～5に保っている。)
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