题目

ADAPTIVE ACTION SPORTS        Adaptive Action Sports was founded in 2005 by Amy Purdy and Daniel Gale.        Amy Purdy was an active snowboarder, until she lost both her legs to bacterial meningitis(脑脊膜炎). She spent three months in the hospital fighting for her life, and doctors gave her a less than two percent chance of survival. Because of meningitis Amy lost circulation in both her legs, and when she came out of the hospital she had prosthetic legs(义肢). When she lost her legs, Amy knew she would be active again, but didn’t know how or when. She struggled to下图为肾单位结构示意图，据图回答问题：（l）一个肾单位包括______________（填图中序号）。（2）图中①是入球小动脉，②与①比较，其内流动的血液中含氮废物含量会_________（增多，减少）。（3）③内的液体为原尿，它是血液经____________处的______________作用而形成。（4）据测定，一个正常成年人一昼夜大约产生180升原尿，而产生的尿只有1.5升，这说明当原尿流经肾小管时，其中对人体有用的物质被肾小管____________进入毛细血管中。（5）细胞代谢废物除了通过肾脏形成的尿液排出外，也能通过呼吸系统和____________排出。