What valve separates two chambers and how do they function by preventing the blood to go to what direction?

bicuspid and tricuspid valve

Explanation:

Tricuspid valve separates right auricle and ventrical whereas bicuspid separates left auricle and ventrical.

they help by preventing the back flow of the blood by avoiding them to go to the position where they came from.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.