Friday, January 4, 2013

Organ Pada Hewan

Kumpulan dari berbagai macam jaringan yang melaksanakan suatu tugas tertentu disebut dengan organ. Derajat dari organisme ditentukan dari makin beragamnya organ yang dimiliki. Sebagai contoh organ adalah usus dan trakea.

a. Usus
Usus merupakan bagian dari sistem pencernaan. Disusun dari beberapa jaringan, susunan dari luar ke dalam adalah:

- Jaringan ikat serosa, fungsinya untuk menggantungkan usus ke organ lain.
- Jaringan otot polos memanjang.
- Jaringan otot polos melingkar.
- Jaringan ikat longgar.
- Jaringan otot polos mukosa.
- Jaringan ikat longgar mukosa.
- Jaringan epitel silindris yang merupakan jaringan terdalam dari rongga usus.

Di samping jaringan-jaringan tersebut di atas juga terdapat jaringan saraf, jaringan darah, dan lain-lain yang menunjang kerja usus.

b. Trakea/batang tenggorok
Trakea merupakan bagian dari sistem pernapasan. Trakea disusun atas 3 lapis jaringan, dari luar ke dalam:
- Jaringan ikat padat.
- Jaringan tulang rawan dan jaringan otot polos.
- Jaringan epitel silindris berlapis banyak semu atau epitel silindris bersilia.
Berdasarkan letaknya, organ dikelompokkan menjadi dua, yaitu organ dalam dan organ luar. Organ dalam tubuh misalnya lambung dan usus. Sedangkan organ luar tubuh misalnya mata, telinga, dan hidung.


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