level: Respiration
Questions and Answers List
level questions: Respiration
| Question | Answer |
|---|---|
| Give four reasons why organisms need energy? | 1)to drive chimical reeactions that keep organisms alive 2)movement - to contract muscles or for movement of substances in plants 3)cell division 4)to maintain constant conditions in the cells and the body |
| Where in a cell does respiration occur? | Aerobic-First stages in cyptoplasm but most energy is released in mitochondria Anaerobic-Only in cyptoplasm |
| What is the balanced word equation for Aerobic respiration? | C6H12O6 + 60S --> 6H20 + 6CO2 (+ energy) glucose --> lactic |
| What are the balanced word equations for Anerobic respiration in both ANIMALS and PLANTS? | Animals: glucose --> lactic acid (+ energy) Plants: glucose → ethanol + carbon dioxide (+ energy) |
| Why do muscles need additional energy when excersizing? | 1)Breathing rate increases to bring more oxygen in and release more carbon dioxide 2)Heart rate increases to supply muscles with more oxygen and remove more carbon dioxide |
| What 2 things happen as a result of anaerobic respiration? | 1)lactic acid levels build up 2)glycogen reserves in the muscle become low as more glucose is used up |
| What are the 2 things that lactic acid can be converted to using oxygen? | 1)oxidised --> carbon dioxide and water 2)converted to glucose then glycogen restoring the glycogen levels in the liver and muscles |