Question

Animals breathe in air containing oxygen and breathe out air containing less oxygen. the consumed oxygen is used...

a. in the glycolisis pathway
b. in the citric acid cycle
c. as an electron acceptor in the respitory electron transport chain
d. in photosynthesis
e. in the conversion of pyruvate to acetyl Co-A

Answer 1

Answer: C

Explanation: The consumed oxygen in animals is used as an electron acceptor in the respiratory electron transport chain. In this process, oxygen is used to help convert the chemical energy stored in food molecules into ATP, the main source of energy for cells. The oxygen is used to accept electrons from the breakdown of glucose, fatty acids, and other energy-rich molecules, allowing for the production of ATP. This process occurs in the mitochondria of cells and is essential for the survival and function of all animals.