Respiration

Technically, ever cell respires due to an active cellular site known as mitochondria. Mitochondria are organelles found in the cells of every complex organism. They produce about 90% of the chemical energy that cells need to survive via respiration. Mitochondria also have a special role in making cells die (apoptosis). This may sound strange, but it is vital for the processes of growth and development.

Thank You! Just a quick question.When the oxygen debt is repaid once the lactic acid has been converted back to glucose and then breaks down in aerobic respiration to form co2 and water where does that oxygen come from when it says 'the oxygen debt is repaid'
Sorry again!

That oxygen is released via the breakdown of glucose (anaerobic respiration) it releases less energy than aerobic. Usually in aerobic respiration we get O2 via inhalation and exhalation (ventilation process). But in anaerobic respiration - glucose is broken down, hence why when we exercise and run out of breath "people say we burn fat" because glucose is broken down to release o2 since cells need a constant supply. Hope this helped and no worries!

as well as the above:

blood flowing through the muscles transports lactic acid to the liver, where lactic acid is converted back into glucose
the glucose produced is supplied to the muscles in the bloodstream; muscles can use oxygen in the blood and glucose from the liver for respiration.
then, when the oxygen and glucose have been completely converted to carbon dioxide and water, the oxygen debt will be repaid since there is no lactic acid left, and the muscles can respire aerobically, releasing more energy.
hence, the liver helps to restore aerobic respiration in the muscles, which may be why it can be counted as an organ of respiration.

hope this helped!

Thank You! So in anaerobic respiration glucose breaks down to produce lactic acid and oxygen then the whole cycle starts again?

lactic acid and energy via oxygen yes, this is paid back later like you said via releasing it as Co2 and water and yes the cycle starts, anaerobic only occurs in heavy movement.