11.肺通氣的原動力來自(      )

A.肺的張縮活動                                          B.呼吸肌的舒縮運動

C.胸內(nèi)負(fù)壓的周期性變化                            D.肺內(nèi)壓和胸內(nèi)壓之差

12.下列不屬于胃液成分的是(      )

A.鹽酸                                                        B.羧基肽酶原

C.黏液                                                        D.胃蛋白酶原

13.下列關(guān)于頭期胃液分泌的敘述，正確的是(      )

A.只有食物直接刺激口腔才能引起              B.是純神經(jīng)調(diào)節(jié)

C.酸度高、消化力強(qiáng)                                   D.傳出神經(jīng)是交感神經(jīng)

14.吸收膽鹽及維生素B₁₂的部位在(      )

A.十二指腸                                                 B.空腸

C.回腸                                                        D.胃

15.安靜時人體的主要產(chǎn)熱器官是(      )

A.骨骼肌                                                     B.腦

C.內(nèi)臟                                                        D.皮膚