Some of the glucose required for cellular respiration in humans is obtained by external food source which are rich in carbohydrates.
What is cellular respiration?
Cellular respiration is the process in which cells combines the oxygen with the foodstuff molecules, and converting the chemical energy into life sustaining activities as energy.
In the human body, we get the glucose for the cellular respiration from the external food source which are riched in carbohydrates, starch, etc. After converting the chemical energy to glucose then oxygen is absorbed in the lungs and circulate the blood through out the body by red blood cells.
Hence, we get glucose from food source.
To know more about cellular respiration, visit the below link:
https://brainly.com/question/2809259
