1.Which of the following is common to both extracellar and intracellular digestion? A> the ability to phagocyte food particles. B> the speed of digestion C> the presence of a digestive cavity D> the ability to consume both large and small food items E> none of all 這題答案為A 想請問一下,對攝食而言在胞內消化有吞食作用我可以理解,但胞外消化會有 吞食作用嗎? 食物在消化道消化為小分子後不就送如血管,之後由血液運輸到各細胞,在經主被動運 輸入細胞內做代謝以供能嗎?(Marcophage雖有吞食作用但與胞內外消化是兩碼子,暫不 論之) 2.Which of the following is not an advantage of extracellular digestion? A> The interior of cells is protected from hydrolytic enzymes. B> Very large portion of food can be consumed at once and digested over a long period of hours to weeks. C> Specialized regions of the cavity can segregate the digested food from nondigested food. D> Digestion can be regulated by hormones. E> Vacuoles allow for direct phagocytosis by individual cells. 這題答案為E;但我想不出解釋的理由~ 希望和大家討論看看喔~ 謝謝大家~ --

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