Trace lactate from exercising muscle into blood and liver, explain its conversion to pyruvate or glucose, and link accumulation to acidity and fatigue using marked questions.
The fastest recorded speed by a human was set by Usain Bolt sprinting in 2009. He achieved a speed of 12.3 metres per second.
During a sprint race, leg muscles produce lactate. Describe what happens to the lactate at the end of the race.
A description that includes three of the following points:
- lactate diffuses (from muscle) into blood (1)
- \{oxidation of lactate / lactate converted\} to pyruvate (1)
- (and then) used in \{link reaction / aerobic respiration\} (1)
- (taken up by the liver where it is) converted to \{glucose / glycogen\} (1)
accept lactate goes to the liver
accept \{removal of hydrogen atoms / dehydrogenation\} to convert to pyruvate
ignore Krebs cycle
accept stored as glycogen in the liver