Things Our Body Needs |
You need food, water and oxygen to survive. You digest food to enable nutrients to be carried by blood to your cells. You breathe in air so oxygen can be transported by blood to your cells to enable energy production. You drink water to maintain blood pressure and volume, and because your cells need it for chemical reactions. Wastes, such as carbon dioxide and food that can’t be digested, are expelled from the body.
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Only watch the first 1.30mins of this video on cellular respiration - the remaining part is senior biology and you will not need to know this.
Read pages 8 & 9 of Amazing Science 9
Questions 1 Why do cells in your body need nutrients? 2 Why do you need water? 3 Why do you need oxygen? 4 Which body system enables food to be broken down into nutrients? 5 Which two body systems work together to absorb oxygen into the blood and transport it around the body?
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