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1问题人教版生物学七年级(2001年版)下册P.101:“膝跳反射受大脑控制吗?为什么?”答案:膝跳反射是瞬时进行的,大脑来不及思考,有关的神经中枢在脊髓内,所以不受大脑的控制。但是,在完成膝跳反射的同时,脊髓中通向大脑的神经会将这一神经冲动传往大脑,使人感觉到膝盖被叩击了。膝跳反射真的不受大脑控制吗?那为什么在实验过程中要求测试者肌肉放松?这不正是对“膝跳反射受大脑控制”的证明吗?
1 Questions PEP Biology Year 7 (2001) Second Edition P.101: “Knee reflex is controlled by the brain? Why?” Answer: Knee reflex is instantaneous, the brain has no time to think, the relevant nerves The center is in the spinal cord, so it is not under the control of the brain. However, when the knee-jerk reflex is completed, the nerves leading to the brain in the spinal cord will pass this nerve impulse to the brain, causing people to feel that the knee has been attacked. Is knee-jump reflex really uncontrolled by the brain? Why does the tester’s muscles relax during the experiment? Isn’t this the proof that the knee-jerk reflex is controlled by the brain?