1. My vital capacity is one of the lowest of the boys in the class. I think it is like this because I am the smallest boy in the class giving me a smaller lung capacity.
2. A usual breath can range from 1/2 a litre in a quiet breath to 6 litres for a tall singing base baritone. Our breaths depend on height, weight, posture, parents genes, cellular condition, chemistry, emotions, breathing skill level, thinking processes and more.
3. Regular exhalation is when all the muscles relax to allow air to leave the lungs, while forceful exhalation is when the muscles are relaxing, but we are also using other muscles in our body to make the thoracic cavity smaller. People cannot train the bronchi or alveoli to obtain more air, but can train the muscles that help expand and compress the thoracic cavity to achieve a greater vital capacity.
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