Question

葡萄糖經(jīng)小腸粘膜上皮進(jìn)入毛細(xì)血管，需透過的磷脂分子層數(shù)是

A．4層                                  B．6層

C．8層                                  D．10層

Answer 1

C

解析:

葡萄糖經(jīng)小腸進(jìn)入毛細(xì)血管需經(jīng)過兩層細(xì)胞：小腸粘膜上皮細(xì)胞和毛細(xì)血管壁上皮細(xì)胞。葡萄糖從小腸進(jìn)入毛細(xì)血管要經(jīng)過4層細(xì)胞膜，每層細(xì)胞膜由雙層磷脂分子層和蛋白質(zhì)構(gòu)成，故共穿過8層磷脂分子層。