How do oxygen and carbon dioxide enter and leave thale animal cell

In animal cells the process is done by Cellular respiration.
This involves 3 cycles:
-Gylcolysis
-Citric acid cycle (krebs cycle)
-Electron transport chain

Fermentation is another cycle, however this only occurs if no oxygen is present.

Oxygen is taken in and carbon dioxide is released.

In lower animals by the process called diffusion and in higher animals by the blood.