Energy from respiration
- Created by: Moodymoo
- Created on: 08-03-14 17:24
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- Energy from Respiration
- Aerobic respiration
- Oxygen + Glucose --> carbon dioxide + water +(energy)
- Takes place in cells
- Function is to provide cells with glucose and oxygen
- Mitochondria
- Most reactions take place here
- They have a folded inner membrane to provide a large surface area
- Reasons for respiration
- Releases energy from our food so cells can use it
- To build up large molecules from smaller ones to make new cell material
- To make muscles contract
- To keep body at a constant temperature
- Responses to exercise
- Muscles start contracting harder and faster, so need more oxygen and glucosse
- Muscles also produce more carbon dioxide which needs to be removed
- Heart rate increases and arteries supplying blood to muscles dilate, increase blood flow
- This then increases supply of oxygen and glucose to muscles
- Breathing rate increases and you breathe more deeply so more oxygen is brought into your body
- Anaerobic respiration
- Respiration without oxygen - glucose is incompletely broken down to form lactic acid
- Less energy is released than aerobic respiration
- After exercising you continue to puff and pant, the length of time depends how fit you are
- You need to get rid of the waste lactic acid, which requires oxygen
- The amount of oxygen you need to break the lactic acid into carbon dioxide and water is called the oxygen debt
- Lactic acid + oxygen --> carbon dioxide +water
- Aerobic respiration
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