SCIENCE
RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They need O2 to break down lactic acid
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They need more O2 for aerobic respiration
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They have to remove excess CO2 from the blood
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The muscle cells need to rebuild their stores of ATP
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Detailed explanation-1: -When you exercise and your muscles work harder, your body uses more oxygen and produces more carbon dioxide. To cope with this extra demand, your breathing has to increase from about 15 times a minute (12 litres of air) when you are resting, up to about 40–60 times a minute (100 litres of air) during exercise.
Detailed explanation-2: -After the 100-meter race is over, the body’s muscle cell needs to restore the ATP and CP that was utilized during the race. This is done by utilizing oxygen from the aerobic system and therefore the athlete breathes heavily after the race for more oxygen consumption.
Detailed explanation-3: -The taking in of air rich in oxygen into the body is called inhalation and giving out of air rich in carbon dioxideis known as exhalation.
Detailed explanation-4: -As the rate of physical activity increases, the rate and depth of breathing increases. This is because, as muscles are working hard (contracting), the rate of their respiration increases, producing larger amounts of CO2 which need to be removed.
Detailed explanation-5: -As muscles move more – for example, if we go from walking to running – the heart pumps faster (increased heart rate) to increase the blood supply and we breathe more quickly (increased respiratory rate) to get more oxygen into the blood.