A leg muscle ferments 0.4 mol of glucose to lactic acid in a sprint…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A leg muscle ferments mol of glucose to lactic acid in a sprint. One mole of glucose holds kJ, and one mole of ATP holds kJ.
- How many moles of lactic acid are made?
- How many moles of ATP are gained, net?
- How much energy is kept in this ATP?
- What per cent of the energy of the glucose is this?
- Why does the muscle ache after a long sprint?
Need a reminder? The key ideaShow
Without oxygen, pyruvic acid takes the hydrogen of NADH, and NAD is made again. Alcoholic fermentation: pyruvic acid decarboxylase gives acetaldehyde and carbon dioxide, then alcohol dehydrogenase gives ethanol. Lactic acid fermentation: lactate dehydrogenase gives lactic acid and no carbon dioxide. The net gain is ATP for each glucose.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Glucose: mol.
Plan. Use the balance for one glucose, then compare with the energy of the glucose.
Step 1. Lactic acid. mol.
Step 2. ATP. mol.
Step 3. Energy kept. kJ.
Step 4. Share. The glucose holds kJ. .
Step 5. The ache. Lactic acid builds up in the muscle and causes the ache.
Answer: mol; mol; kJ; ; lactic acid collects.
Check. The share is far below the of complete respiration.
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