北师大版英语高二下册unit21humanbiology

北师大版英语高二下册unit21humanbiology内容摘要：

ich reeives everything you digests your food and sends vitamins and minerals into the blood. brain stomach This an beats at regular intervals 100,000 times a day. With each beat, it circulats 80 ml of blood through the body—that’s 8,000 litres of blood per day! It pumps blood into the lungs, where it receives oxygen, Before being pumped around the rest of the body. heart This is a very delicate an. There are two in a body and they have delicate lids which protect them. Light enters and reaches special light sensitive cells. These work like a camera and finally send signals to the brain. eyes These ans absorb oxygen and get rid of carbon dioxide. They are found on either side of the heart. They receive air as a result of breathing and when blood passes through, They give it oxygen. lungs Lesson 1 Super Athletes Which champion athlete do you think can run 100 meters in 8 seconds? Is it possible for you? Maurice Greene 第一位同时拥有 50米、 60米和 100米 3 项世界记的男选手。 Floyd Landis 2020年环法自行车赛冠军 , 第三位获此殊荣的美国人 Marion Jones 2020年悉尼奥运会 女子 100米、 200米、4x400米接力 冠军 Florence Griffith 奥运短跑三项金牌得主，同时也是 100米及 200米短跑的世界纪录保持人 Ben Johnson 汉城奥运会以惊人成绩打破男子百米世界纪录并夺得金牌 Super Athletes doping n. 服用兴奋剂 genetherapy 基因疗法 dash n. 短跑。