In working skeletal muscle under anaerobic conditions, glyceraldehyde 3-phosphate is converted to pyruvate (the payoff phase of glycolysis), and the pyruvate is reduced to lactate .
But, after a while they stopped jumping, Meyerhof found that the legs were full of lactic acid — or, more accurately, lactate, which is lactic acid minus a proton.
If you want to lift for more reps, you'll have to do more high rep training, which also increases metabolic adaptation and lactate threshold, combating muscle fatigue.
The larger spaces between endothelial cells allows fluid, immune cells and large proteins like lactate dehydrogenase (LDH), which is found in all cells, to leak out of the capillaries.
While lactating, the glands make oily secretions that keep the nipple lubricated and may also release compounds to make the nipple seem yummy for a baby.