There are two main types of respiration: aerobic respiration and anaerobic respiration. Aerobic respiration is the more efficient type of respiration, and it requires oxygen in order to occur. During aerobic respiration, oxygen is used to break down glucose, a type of sugar, into carbon dioxide and water. This process releases energy that the body can use to power its activities.
Anaerobic respiration is a less efficient type of respiration that does not require oxygen in order to occur. During anaerobic respiration, glucose is broken down into lactic acid instead of carbon dioxide and water. This process releases energy that the body can use to power its activities, but it also produces lactic acid, which can cause fatigue and muscle soreness.
Respiration is a vital process that all animals must perform in order to survive. By taking in oxygen and giving off carbon dioxide, animals are able to generate the energy they need to power their activities and sustain their lives.