go to jove.com

HIGH SCHOOL

Biology

Concept Videos

Biology

This is a free preview. For full access

Nutrition and Digestion

Small and Large Intestine Functions

Description

The small and large intestines complete digestion and absorb nutrients, water, and electrolytes. They are two structurally distinct organs with different shapes and jobs. Together, they move food material from the stomach toward elimination.

The small intestine is about 7 meters long and has an i...

Transcript

小肠和大肠负责

吸收营养和水

虽然小肠相当狭窄

但这个器官大约22英尺长

并且压缩到腹腔中

消化物首先到达十二指肠

然后前往中间和最长的部分 即空肠

在这里 内衬包含粘膜褶皱

覆盖有指状绒毛

上皮细胞的上覆层具有

称为微绒毛的细胞质延伸

这三种结构增加了

小肠的表面积

以确保最佳营养效果

在小肠的末端是回肠

它通过回盲瓣

连接到大肠

在大肠的第一部分 ...

More videos by Standards