The investigators performed a series of tissue-transplant experiments with hamsters (仓鼠). Some of the animals were normal hamsters, which have a circadian cycle of 24 hours; the others were mutant(变异型)hamsters whose cycles were only 20 or 22 hours long.
The scientists first removed the SCN from the brans of the hamsters in both groups. They then implanted an SCN from a mutant hamster into the brain of each normal animal, and vice versa. When the hamsters had recovered from their operations, the circadian rhythms of the two groups were reversed. The normal hamsters had a daily cycle of 20 to 22 hours, and the mutants were on a 24-hour cycle.
The identification of the internal clock is an important stepping-stone in understanding the basic, automatic mechanisms of brain function. It may also help in finding ways to relieve human sleep disorders.
The purpose of the experiments was to fund out how the clock works.
A.Right
B.Wrong
C.Not mentioned
第1题
治疗弥散性血管内凝血时,用于监测肝素用量的试验是
A.出血时间
B.3P试验
C.血小板计数
D.APTT(激活的部分凝血活酶时间)
E.纤维蛋白原定量
第2题
治疗弥散性血管内凝血(DIC)时,监测肝素用量的试验是
A.血小板计数
B.3P试验
C.出血时间
D.APTT(激活的部分凝血活酶时间)
E.纤维蛋白原定量
第3题
治疗弥散性血管内凝血时,监测肝素用量的试验是
A.3P试验
B.血小板计数
C.出血时间
D.APTT(激活的部分凝血活酶时间)
E.纤维蛋白原定量
第4题
治疗弥散性血管内凝血时,监测肝素用量的试验是
A.纤维蛋白原定量
B.出血时间
C.APTT
D.3P试验
E.血小板计数
第5题
治疗弥散性血管内凝血时,监测肝素用量的试验是
A.3P试验
B.出血时间
C.APTT
D.纤维蛋白原定量
E.血小板计数
第6题
治疗弥散性血管内凝血时,监测肝素用量的试验是
A.3P试验
B.出血时间
C.APTT
D.纤维蛋白原定量
E.血小板计数
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!