The respiratory system brings oxygen from the air into your body and removes carbon dioxide waste. It includes the nose, trachea, lungs, and diaphragm
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Why do we yawn?
Yawning occurs when the body needs more oxygen or is tired. It forces a deep breath that delivers oxygen to the brain and body. Scientists are still not entirely sure why we yawn, but it may also help maintain alertness.
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How much air do your lungs hold?
Adult lungs can hold about 6 liters of air, but during normal breathing, only about 0.5 liters is exchanged with each breath. This is called tidal volume. The rest remains in the lungs called residual volume.
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Can you hold your breath indefinitely?
No, you cannot hold your breath indefinitely because carbon dioxide builds up in your blood. This triggers a reflex that forces you to breathe even if you do not want to. The urge to breathe becomes overwhelming after 1 to 2 minutes.
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