[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.
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