Biology Respiration and Gas Exchange

Resperation is something all cells do. It provides us with energy to do the 7 Life Processes

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  • Created by: Livy
  • Created on: 22-01-14 14:36

The Differences Between Aerobic and Anaerobic Resp

Aerobic respiration requires oxygen and Anaerobic respiration does not. Anaerobic Respiration produces lactic acid, which is poisionous to cells. They both release energy, but Aerobic respiration releases much more energy. 

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The Word and Symbol Equations for Aerobic Respirat

Glucose = Oxygen = Energy = Carbon Dioxide = Water

C6H12O6 + 6O2 = CO2 = 6H2O

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The Word Equations for Anaerobic Respiration


Glucose = Ethanol = Carbon Dioxide + Energy

C6H12O6 = 2C2H5OH + 2CO2


Glucose = Lactic Acid + Energy

C6H12O = 2C3H6O3

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Key Definitions

Breathing: Movement of air in and out

Ventilation: Mechanism of moving air in and out of lungs

Respiration: Chemcal reaction to release energy from food

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Occurs in aveoli between the air and capillaries

How is this kept fast?

Large surface area - each air sac is made of many aveoli

Good blood supply - Each avoli is covered in capillaries

Short Diffuson path - The capillaries and aveoli wall are only one cell thick 

Aveolus walls are moist - the oxygen can dissolve into this layer before moving into the capillaries. This helps diffusion to occur quickly

Why do we need this?

So the oxygen will travel around our bodies and make us respire aerobically, or else we will respire anaerobically. Diffusion also helps remove Carbon Dioxide which is poisionous

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