Question

When do cells use anaerobic respiration to fuel themselves?

a. when ATP is absent
b. when oxygen is absent
c. when glucose is absent
d. when lactic acid is absent

Answer 1

Cells use anaerobic respiration when oxygen is absent.

Step-by-step explanation:

Cells use anaerobic respiration to fuel themselves when oxygen is absent. In the absence of oxygen, pyruvate enters an anaerobic pathway called fermentation, where it can be converted into lactic acid. This process occurs in most cells of the body when oxygen is limited, mitochondria are absent, or nonfunctional.