Question

After taking a long deep breath we do not respire for some seconds due to

Answer 1

Blood cannot become more than 100% saturated with oxygen. In deep breathing more carbon dioxide is washed out of the blood. This makes oxygen cling more strongly to haemoglobin in red blood cells and therefore oxygen delivery to the tissues is made worse and causes oxygen toxicity. But comparatively, more carbon dioxide levels can improve oxygen delivery. Hence lungs keep carbon dioxide levels high in inhaled air and therefore in the blood.

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