题目

The Great Barn Adventure One morning when I was 11, I explored the town’s abandoned round grain barn（谷仓）. I found a chained sliding door that was wide enough for me to pass through. Inside, there was a heavy smell of dead mice in the dark. After my eyes adjusted, I noticed a shaft (升降机井) that rose all the way to the top of the barn. On one side was a one-man elevator with a long rope and roller. I stepped onto the platform and gave the rope a drag and the elevator began sliding up the shaft, but stopped halfway. After a brief panic attack, I noticed holes in the wall下图表示人体中甘油三酯的代谢过程．图中箭头表示物质的去路和物质的合成或分解．（1）血液中的脂质总称为血脂．血脂的主要成分除甘油三酯外还有胆固醇、 和游离的脂肪酸．（2）肝脏细胞中过多的甘油三酯以 的形式通过④进入血液．（3）在肝细胞和脂肪细胞中，由胰岛素参与的过程是 ．（填数字）（4）若图中血管发生动脉粥样硬化，则可能是 的含量过低，该脂蛋白的作用是 ．（5）血液在血管中流动，对血管壁产生一定的侧压力，即血压．我们常说的血压是指图中  部位的血压（箭头表示血流方向）．若主动脉和大动脉管壁的弹性下降，则舒张压 ，脉压 ．（6）人体的血压受到神经和激素的调节．参与降压反射的中枢是 中枢，然后通过副交感神经神经影响效应器 的活动，从而使动脉血压有所下降．