北师大版高中英语模块7--Unit 21 warm-up

[00:02.44]Unit 21 Human Biology Warm-up [00:07.39]Exercise 2 Listen and guess which parts of [00:11.04]the body of being described. [00:13.00]Which words help you to decide. [00:16.79]1 This organ weighs about a kilo [00:19.77]and is made up of two sides. [00:22.04]It is like a super computer [00:23.88]that processes information. [00:27.89]2 This organ beats 100,000 times a day. [00:33.24]With each beat it moves eighty millilitres [00:36.20]of blood-that's 8,000 litres of blood per day! [00:39.94]It pumps blood into the lungs, [00:42.38]where it receives oxygen, [00:43.82]before being pumped around the rest [00:45.61]of the body. [00:47.69]3 These organs absorb oxygen and get rid [00:51.36]of carbon dioxide. [00:52.96]They are situated on either side of the heart. [00:55.84]They receive air as a result of breathing [00:58.61]and when blood passes through, [01:00.58]they give it oxygen. [01:03.39]4 This is a very delicate organ. [01:06.82]It's moved by six muscles [01:09.04]and consists of various different layers. [01:11.94]Light enters and reaches special light [01:14.52]sensitive cells. [01:16.40]This works like a camera and finally [01:18.50]sends signals to the brain. [01:21.60]5 This is about the size of a closed hand. [01:25.24]Its job is to break down the food [01:27.07]we eat so that we have energy [01:29.04]and can be healthy and strong. [01:30.33]

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