Question

what is oxygen

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Answer 1

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• oxygen is a gas,which is colorless, odorless and tasteless. Two oxygen atoms join to form a single oxygen molecule, hence the term O2.
• For animals, breathing is the most important use of oxygen and in terms of physiology, our respiratory system and circulatory system carries oxygen to our cells and organs.
• Oxygen is essential for respiration because the body uses it to 'burn' food molecules. Animals take in oxygen when inhaling and give off carbon dioxide when exhaling.
• Oxygen makes up almost 21% of the total gases in air, with most of the remaining gas being physiologically inert nitrogen. Although we inhale 21% oxygen, a person's exhaled breath contains about 16%.
• This means that the human body only uses about one quarter of the O2 inhaled, leaving sufficient available for rescue breaths. This is why rescue breathing works - it can supply a non breathing patient with enough oxygen to support life.

Answer 2

Oxygen is a gas that you cannot see, taste or smell. Plants and animals cannot live without oxygen.

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