人体面对压力或紧急状况时，体内会释放与压力反应有关的激素，对机体起保护作用，这叫应激反应。下面不属于应激反应的一项是：
A．胃肠运动增加
B．呼吸速率增加
C．心跳速率增加
D．肌肉中肝糖的分解作用增加
参考答案：A
解析：本题考查生物学常识，不属于应激反应的是A项。人体面对压力或紧急状况时，体内会释放甲状腺激素和肾上腺素。甲状腺激素释放会引起B、C项，肾上腺素释放会引起D项。
| Modern industrial society grants little status to old people. In fact, such a society has a system of built-in obsolescence. There is no formal system for continuing our education throughout our life in order to keep up with rapidly changing knowledge. When our education and job skills have grown obsolete, we are treated exactly like those who have never gained an education or job skills and are not encouraged or given the opportunity to begin anew. As a society becomes more highly developed, the overall status of older people diminishes. Improved health technology creates a large pool of old people, who compete for jobs with the young. However, economic technology lowers the demand for workers and creates new jobs for which the skills of the aged are obsolete, forcing older people into retirement. At the same time, young people are being educated in the new technology and are keeping pace with rapid changes in knowledge. Finally, urbanization creates age-segregated neighborhoods. Because the old live on fixed incomes, they must often live in inferior housing. All these factors -- retirement, obsolete knowledge and skills, inferior standards of living -- lower the status of the aged in society. A century ago, when one could expect to live only to 50 or so, the life span more or less coincided with the occupation and family cycle. But today the average life span allows for fifteen to twenty years of life after these cycles. It appears that our life span is outpacing our usefulness in society. |
Which of the following statements is NOT true
A．Retired people could only live on fixed incomes.
B．Retired people are more skillful than young people.
C．Young people are educated in the new technology.
D．Young people are keeping pace with rapid changes.