瞳孔对光反射中枢位于（　　）

【名词&注释】

脑脊液(cerebrospinal fluid)、中枢化学感受器(central chemoreceptor)、刺激物(irritant)

[单选题]瞳孔对光反射中枢位于（　　）

A. 枕叶皮质
B. 丘脑外侧膝状体
C. 中脑
D. 脑桥
E. 延髓

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学习资料：

[单选题]_________

根据以下内容，回答下面的题目。Insure means to protect _51_ a loss of money．Most people can budget their money so that their income will cover expected expenses _52_ food, clothing, housing, and public services．But, there is no way to know _53_ who will suffer a crisis (危机) such as a serious illness, fire, flood, or a car accident．Such crises usually _54_ great expense．Even if people could predict crises, it would be hard to save enough money to _55_ the expenses．Insurance is a system _56_ a company collects money from many individuals and then pays certain expenses whenever one of those insured individuals is faced with a certain crisis．An insurance policy _57_ how much the insurance costs and how much the company will pay when a policy holder is faced with a certain crisis．There are many different kinds of insurance, _58_ hospital, motor-car and fire．Insurance can be rather expensive but most people buy insurance of some kinD．Insurance is something _59_ people buy and hope they will _60_ need．_________

A. such as
B. for example
C. that
D. the same as

[单选题]中枢化学感受器最敏感的直接刺激物是（　　）

A. 脑脊液中的C02
B. 血液中的H+
C. 血液中的CO2
D. 脑脊液中的P(O2)降低
E. 脑脊液中的H+

[单选题]室内压最低是在 （　　）

A. 等容收缩期
B. 等容舒张期
C. 快速充盈期
D. 减慢射血期
E. 快速射血期

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