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1.D.血管的这些丰富的吻合为防止供应大脑的任何大动脉堵塞提供了另一条通路,因而保护了大脑。2、C.脑组织代谢需要大量的氧与葡萄糖,但不贮存这些物质,心脏每次收缩博出70ml 血,其中约有10～15ml 流至大脑。3、B.在脑桥-延髓结合处两侧椎动脉汇合形成基底动脉,椎动脉和基底动脉供应脊髓上部、脑干、丘脑、小脑和听觉前庭器官。4、D.在脑局部缺血期,如果血流恢复则无持久性损害。当血流中断30秒时,出现脑缺血,缺氧5分钟后将出现脑梗塞。5、B.小动脉具有发育良好的肌壁,使其对血压,二氧化碳的变化及调节局部血流时,对氧的
1.D. These rich anastomoses of blood vessels protect the brain by providing another avenue for preventing any blockage of the large arteries supplying the brain. 2, C. brain metabolism requires a lot of oxygen and glucose, but do not store these substances, the heart of each contraction Bo Bo 70ml, of which about 10 ~ 15ml flow to the brain. 3, B. The basilar, vertebral, and basilar arteries are confluent with the basilar artery on both sides of the pontine-medulla oblongata junction to supply the upper part of the spinal cord, the brainstem, the thalamus, the cerebellum and the auditory vestibular organ. 4, D. In the ischemic period of the brain, there is no permanent damage if blood flow is restored. When the blood flow is interrupted for 30 seconds, cerebral ischemia occurs and cerebral infarction occurs after 5 minutes of anoxia. 5, B. arterioles with well-developed muscle wall, making it the blood pressure, carbon dioxide changes and local blood flow regulation, the oxygen