B1.3 Respiration Flashcards
1
Q
What is aerobic respiration
A
- Your energy comes from chemical stores in the food you eat. To transfer this energy, glucose reacts with oxygen in a series of chemical reactions called aerobic respiration.
2
Q
What is the word equation for aerobic respiration
A
Glucose + Oxygen ——> Carbon Dioxide + Water
3
Q
State 3 main uses of ATP in the body
A
- To synthesise larger molecules from smaller ones.
- For movement.
- To stay warm.
4
Q
State why respiration is an example of an exothermic reaction
A
During the process of respiration energy is transferred to the surroundings by heating.
5
Q
Describe anaerobic respiration
A
- During exercise your muscles need to transfer more energy than normal when they contract.
- However, your heart rate cannot increase fast enough to provide enough oxygen for your body.
- So your body starts to transfer energy from its chemical store in glucose by anaerobic respiration. This series of chemical reactions does not require oxygen.
6
Q
Where does aerobic respiration take place?
A
Aerobic respiration takes place in the mitochondria of a cell and is controlled by a specific enzyme
7
Q
What is the word equation for anaerobic respiration?
A
Glucose —> Lactic acid
8
Q
Why do you normally respire aerobically?
A
- Aerobic respiration produce more ATP molecules per glucose molecule than anaerobic respiration the the glucose molecule is fully broken down.
- Lactic acid from anaerobic respiration can cause cramps and pain.
- When you have finished exercising you keep on breathing heavily. The extra oxygen you inhale reacts with the lactic acid, breaking it down. The oxygen need for this process is called the oxygen debt.
9
Q
What is fermentation and its word equation?
A
- Anaerobic respiration in microorganisms and plant cells produces ethanol and carbon dioxide instead of lactic acid. This is fermentation.
- Glucose —> ethanol + carbon dioxide
10
Q
What is fermentation and its word equation?
A
- Anaerobic respiration in microorganisms and plant cells produces ethanol and carbon dioxide instead of lactic acid. This is fermentation.
- Glucose —> ethanol + carbon dioxide
