Bradley decides one day to run a marathon with any training. after ten minutes has elapsed and bradley has run half a mile, he begins to get cramps in his thighs. he is also breathing very rapidly. what causing the cramps on his legs?

The cramps are caused by the formation of the lactic acid in the muscle cells. This occurs due to the anaerobic respiration in the muscles. When the athletes run, the muscles need more ATP and for more ATP to form, the respiration is required to breakdown the glucose to form ATP with help of oxygen. After sometime a lack of oxygen occur, which causes the cell to make ATP through anaerobic respiration to occur, which lead to formation of the lactic acids and causes cramps.

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.

i'll try what topic lol