HUMAN PHYSIOLOGY
BREATHING AND RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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more oxygen is picked up at the lungs for delivery to the working muscles
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less oxygen is picked up at the lungs for delivery to the working muscles
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your muscles are resting
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your lungs need more energy to function
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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: -Your blood picks up oxygen as it travels through your lungs and delivers it to the muscles you’re using. As your level of activity increases, your breathing rate increases to bring more air (oxygen) into your lungs so that your lungs can pump more oxygen into your blood and out to your muscles.
Detailed explanation-3: -Answer: The breathing rate during exercise is increased while during sleep it goes down.
Detailed explanation-4: -the breathing rate and volume of each breath increases to bring more oxygen into the body and remove the carbon dioxide produced. the heart rate increases, to supply the muscles with extra oxygen and remove the carbon dioxide produced.
Detailed explanation-5: -Vasodilation of the arterial tree results in increased blood flow, which carries more oxygen to the tissues per unit time. In addition, the enhanced blood flow increases microvessel hematocrit, which also supports increased oxygen delivery to the active muscles (Figure 10).