1. (a) (i) X is a finger-like projection of the intestinal wall.
X有指狀突起結構
This feature provides a large surface area for food absorption.
可以增加表面面積幫助食物吸收
The epithelium of X is very thin / one-cell thick.
X的表面很薄/只有一層細胞的厚度
This shortens the distance of diffusion / transport of digested food substances.
可以減少滲透的距離/移動已消化的食物
(ii) X → hepatic portal vein → liver → hepatic vein → vena cava → (heart)
X->肝門靜脈->肝->肝靜脈->靜脈->心臟
(iii) The peristaltic contraction of the muscle layer
pushes food along the small intestine.
This also helps to mix food with digestive enzymes.
肌肉屠會蠕動收縮，幫助食物在小腸內移動。同時可以幫助食物與消化酶混合
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