陸龜的消化系統 發文者:納希瑟斯

PUPPY

鑑於有些龜友對龜的生理常有誤解，
故提供出來給大家參考看看，
其實龜的消化系統跟人類是蠻像的．．．．．．．．

其實胃的主要功能還是在　1.儲存食物　2.攪伴、磨碎食物　3.分泌消化液分解食物；
食物的營養是在小腸吸收，而水份是在大腸吸收


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( 以下內容節錄自 thinkquest 網站 )(原始網址內容已經不見了．．．．)


The digestive system processes the food that the tortoise eats.  

The food is taken in through the mouth and then moistened by the salivary glands.  

The food then moves into the esophagus.  

The walls of all the organs related to the digestive tract are lined with smooth muscle tissue to push the food along.  Smooth muscles operate involuntarily.  The tortoise doesn't even feel the contractions as the food moves into the stomach.  

When in the stomach, enzymes and acids that are attached to the stomach's walls break down the food.  

The food then moves past the liver where it is stripped of some of the nutrients it has.  The liver makes bile out of these nutrients.  

The food then pushes up against the gall bladder which decides whether to release the bile to the small intestine or keep it in the liver.

In the small intestine, all the remaining nutrients are taken from the food through small openings (called 'villi') in the walls of the intestine.  The food then moves on to the large intestine.  

The large intestine's job is to try to absorb the water so that the body can use some of it.  

The large intestine contains much bacteria, including E. Coli and Salmonella, which are not harmful to the tortoise (in fact they are necessary), but they can be quite harmful to the human taking care of the tortoise.  

At long last, the food reaches its destination: the anus.  This organ dutifully deposits the feces whenever it pleases.

{大意翻譯了一下：}
消化系統是用來處理陸龜吃進去的食物。

食物先由口吃進去，經過唾液腺潤濕然後進到食道裡去。

整個消化道管壁都有一層平滑肌用來推進食物。

平滑肌是非自主性動作，不能由意識控制，龜甚至在食物跑到胃裡都還感受不到平滑肌的收縮。

在胃裡，消化酵素和胃酸從胃壁跑出來分解掉食物。

接下來食物會經過肝臟，肝臟會製造膽汁來分解營養物，食物會刺激膽囊收縮，決定將膽汁分泌至小腸或讓膽汁留在肝臟。

在小腸裡，所有剩下的營養物從小腸壁上的絨毛吸收，

然後剩餘的食物殘渣會移動到大腸去。

大腸的作用就是吸收水份讓身體運用。

大腸內含有許多菌種像大腸桿菌和沙門氏菌，這些菌對陸龜無害甚至於是必需的；但是它們可能對接觸陸龜的人造成傷害！

最後食物到達最終的地點肛門而形成糞便。