1. How does your vital capacity compare to others in the class? Describe some reasons why you think your vital capacity is what it is. Why are the highest and lowest vital capacities the way they are?
Compared to others in the class, my vital capacityis above average. I believe this is due to my size. I am bigger than most of the people in the class. I think the smaller you are, the less vital capacity you will have.
2. How much air is in a usual breath? Why are our breaths the volume that they are?
For guys that are around 18 years old, their usual breath is on average, 4 litres and for girls, it is 2.75 litres. A breath's volume depends on health, age and how big or small the person is.
3. How is the mechanism of exhaling forcefully different than a usual exhalation? Why would practice at this via exercise/instrument playing/singing make you better at it?
Usual exhalation and forceful exhalation is different because during forceful exhalation, the diaphragm does not relax, but instead strains the diaphragm and thoracic cavity. The dipahragm is a muscle, and iwth any muscle, it gets stronger with use. By exercising, playing an instrument, or singing, it strengthens your diaphragm and increases your vital capacity.
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