Your muscles produce this when there are isn't enough oxygen for aerobic respiration

Fermentation occurs only when there is not sufficient oxygen available to permit aerobic reactions. (Note, this isn’t pictured in that overall picture at the top of this post).

Let’s pretend your muscles don’t have enough oxygen to attach these “hot potato” hydrogens onto oxygen. The NAD will then reattach these hydrogens back onto the middle carbon of each pyruvate to create lactic acid. The same way pyruvate is known as pyruvic acid, lactate is also called lactic acid, they are the same thing.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this

protein makes up the building blocks of organs, muscles, skin, hormones and pretty much everything that matters in your body.

some choices are:

peanut butter

seeds

eggs

yogurt

meats

fish

so pretty much meat, dairy, nuts, and grains.