Biology 3

Biology 3 Revision- Keeping internal conditions constant

• For the body to work properly the conditions surrounding your cells must stay constant.
• As you move you produce energy which warms up the body
• As you respire you produce waste
• When you digest food you take millions of molecules into your body
• HOMEOSTASIS- helping to keep the internal environment constant.

REMOVING WASTE:

• Cells of the body contantly produce waste products, the products of chemical reactions which take place in cells.
• The more extreme conditions, the more waste products the cells make
• Two main poisonous waste products Urea and Carbon Dioxode.

How to remove Carbon Dioxide:

• C02 is produced during respiration (food molecules break down and release energy to cells)
• Every cell respires, so every cell produces Carbon Dioxide
• Dissolved Carbon Dioxide produces an acidic solution which can affect the working enzymes in cells.
• CO2 moves out of cells into the…