Anaerobic Respiration

Humans could not function using just anaerobic cellular respiration but there are times when our body relies on anaerobic cellular respiration to function. Our body switches to using anaerobic cellular respiration when your muscles expend ATP at a rate faster than your bloodstream’s delivery of oxygen from your lungs to your muscles. However, the process of fermentation relies on glycolysis without oxygen but only produces two ATP molecules for each glucose molecule broken down. Our body is much for efficient when our cells are using cellular respiration to gather food energy.
Warm-blooded creatures, like mammals and birds, try to keep the inside of their bodies at a constant temperature. They do this by generating their own heat when they are in a cooler environment, and by cooling themselves when they are in a hotter environment. To generate heat, warm-blooded animals convert the food that they eat into energy. They have to eat a lot of food, compared with cold-blooded animals, to maintain a constant body temperature. Only a small amount of the food that a warm-blooded animal eats is converted into body mass. The rest is used to fuel a constant body temperature. Cold-blooded creatures take on the temperature of their surroundings. They are hot when their environment is hot and cold when their environment is cold. In hot environments, cold-blooded animals can have blood that is much warmer than warm-blooded animals. Cold-blooded animals are much more active in warm environments and are very sluggish in cold environments. This is because their muscle activity depends on chemical reactions which run quickly when it is hot and slowly when it is cold. A cold-blooded animal can convert much more of its food into body mass compared with a warm-blooded animal.