Answer:
Aerobic respiration
occurs in normal conditions in human beings. Under intense conditions such as
exercises heavy, muscles demand too much energy (ATP) and consume much more
oxygen to produce that energy.
This high
consumption leads to oxygen scarcity and the muscle cells begin to make lactic
acid by anaerobic respiration to fulfill their energetic needs. Similarly,
yeast cells under deficient conditions of oxygen carry out anaerobic respiration,
forming ethyl alcohol and .
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