What happens to the lactic acid that builds up in a working muscle?
AIt is stored inside the muscle fibres
BIt is exhaled from the lungs as a gas
CIt is carried in blood to the liver
DIt is passed out unchanged in urine
Answer & Solution
Correct answer: C. It is carried in blood to the liver
1. Lactic acid accumulation in muscles must be removed by the blood circulation.
2. The lactate is brought to the liver for further metabolism.
3. Once there, it can be reconverted into pyruvic acid and further catabolized for energy.
4. Urea, not lactate, is the nitrogen waste that leaves the body in urine.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.5 Metabolism without Oxygen_
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