Because oxygen is used in (aerobic) respiration
The amount of oxygen that is passed through the blood to the tissues and organs causes a difference in the amount that you inhale and exhale. You inhale a larger amount than you exhale.
When you inhale, yes, when you exhale, no.
The air you inhale contains higher levels of oxygen and lower levels of carbon dioxide compared to the air you exhale, which has lower levels of oxygen and higher levels of carbon dioxide. Additionally, exhaled air may also contain other gases and small amounts of water vapor.
It is impossible to inhale trough youre stomach unless you toke a breath but if you meant inhale trough your mouth than you would not be able.
When we inhale, the air enters our respiratory system and gets warmed and humidified, which increases its moisture content. As we exhale, the air has picked up moisture from our lungs and respiratory tract, leading to a higher water vapor content compared to the air we inhale.
Humans exhale more water vapour than they inhale because water vapour is a product of respiration which means that your body creates it so has more to get rid of.
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To use an incentive spirometer: Sit upright and hold the spirometer in an upright position. Exhale completely, then place your lips around the mouthpiece. Inhale slowly and deeply to raise the piston or ball inside the device. Try to keep the piston or ball elevated as long as you can, then exhale slowly. Repeat 5-10 times every hour during waking hours as prescribed by your healthcare provider.
During normal breathing at rest, inspiration is an active process while expiration is passive. So under normal conditions, you put more energy into inspiration than expiration.
Men's lungs are bigger
The amount of carbon dioxide exhaled is always greater than the amount inhaled because part of the oxygen inhaled is converted into carbon dioxide by metabolic processes of digestion, while any carbon dioxide inhaled remains unchanged in the body and is always exhaled again.
Carbon dioxide (CO2) typically shows the greatest difference in percent between inhaled and exhaled air. When we inhale, the air we breathe in contains around 0.04% CO2, while the air we exhale can contain around 4-5% CO2 due to the waste gas produced by our body's cellular respiration process.