AP BIOLOGY

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: -As you and your muscles work harder to run faster and further, your muscles require more oxygen to make more energy. Over time, with continued exercise, your heart and lungs respond by becoming more efficient at delivering oxygen and making energy.

Detailed explanation-4: -For more energy, the person needs more supply of oxygen because energy is released by the process of cellular respiration. For this more oxygen supply to the lungs, the person starts breathing rapidly.

Detailed explanation-5: -Common causes of a high respiratory rate include anxiety, fever, respiratory diseases, heart diseases, and dehydration. Common causes of a low respiratory rate include drug overdoses, obstructive sleep apnea, and head injuries. If a person is experiencing an abnormal breathing rate, they should contact a doctor.