The answer is that the gene is dominant
Humans ferment lactic acid in muscles where oxygen becomes depleted, which is why sometimes if you finish a run and don't stretch soon you have have discomfort. <span />
1. blood vessels dilate
2. there is an aggregation of platelets (blood clots)
3. fibroblasts make collagen (healing agent under the skin)
4. neutrophilis consume the bacteria
5. macrophages remove the damaged tissue
6. the wound closes
hope that is right good luck