What causes lactic acid to build up in muscle cells?

anaerobic metabolism.

Explanation:

When you don't have or there is not enough oxygen in the muscles  to break down glucose and the sugar and it called anaerobic respiration

Explanation:

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.

1 digestive system

2 stomach

3 bladder

4 carbon deoxide

5 tiger