Answers by visitors named: semoon

slugs have a breathing hole.it opens and closes as the slug travels along its moist slime.

beacuse smoking has nicotine in it and dat brings makes ur blood pressure rise. hope dat answered ur question

in a 200 meter race muscular conractions are so vigorous that maximum aerobic respiration is unable to produce energy fast enough to meet the required demand.if the vigorous muscular contractions continue then extra energy has to be produced.the muscle cells carry out anaerobic respiration to produce extra energy.lactic acid is formed in the process.since there is insufficent oxygen to meet the demands of vigourous muscular contractions,the muscles are said to incur an oxygen debt.lactic acid concentrations build up slowly in the muscles,and may eventually become high enough to cause fatigue and muscular pains.the body then needs to rest and recover.during the period of rest,the breathing rate continues to be fast for some time.this is to provide sufficent oxygen to repay th oxygen debt.lactic acid is also removed from the muscles and transported to the liver.in the liver,some of the lactic acid is oxidised to produce energy.this energy is used to convert the remaining lactic acid into glucose.when the lactic acid is used up,the oxygen debt is repaid.glucose is then transported back to the muscles.the body is now ready for another race. hope dat answeres ur 1st question.bye