BI-1691
Diffusion
Biology · Secondary 4 · Hard · Diffusion
During vigorous exercise, lactic acid builds up in a runner’s leg muscles and then diffuses into the blood. Which statement best explains why lactic acid moves from the muscles into the blood?
- Lactic acid moves from a region of higher concentration in the muscles to lower concentration in the blood by diffusion.
- Lactic acid is pumped from the blood into the muscles using energy from respiration.
- Lactic acid moves randomly between muscles and blood until both have equal volumes.
- Lactic acid moves from the blood into the muscles because blood pressure is higher.
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