Web Results

science.howstuffworks.com/question493.htm

We breathe air that is 21 percent oxygen, and we require oxygen to live. So you might think that breathing 100 percent oxygen would be good for us -- but actually it can be harmful. So, the short answer is, pure oxygen is generally bad, and sometimes toxic. To understand why, you need to go into ...

www.reference.com/science/percentage-air-breathe-oxygen-fe7da7e70f7fb40f

The air that makes up Earth's atmosphere contains 20.9 percent oxygen. This is true up to about 70,000 feet above sea level. However, above 10,000 feet, the atmosphere becomes too thin to support human life, even though its proportions do not change much.

sciencing.com/minimum-oxygen-concentration-human-breathing-15546.html

Humans need oxygen to live, but not as much as you might think. The minimum oxygen concentration in the air required for human breathing is 19.5 percent. The human body takes the oxygen breathed in from the lungs and transports it to the other parts of the body via the body's red blood cells. Each cell uses and requires oxygen to thrive.

sciencing.com/gases-make-up-air-breath-8450810.html

The majority of the air we breathe is made up of nitrogen and oxygen, though you'll also find argon, carbon dioxide and other gases in trace amounts. Nitrogen: Abundant and Inert It’s a common misconception that oxygen is the most abundant gas in the air breathed on Earth; that honor goes to nitrogen, which makes up 78 percent of the air.

www.quora.com/If-the-air-is-78-nitrogen-and-21-oxygen-why-do-we-say-we-breathe...

Interesting one, let's see why we don't breathe in nitrogen instead of oxygen, despite the fact that nitrogen is the largest constituent of air. Basically, when we breathe in, we breathe in oxygen together with nitrogen and other constituents of a...

byjus.com/biology/composition-gases-breathe

When we exhale, the composition of the air remains almost same as the air we inhale, only the percentage of carbon dioxide and oxygen changes. The amount of inhaled air contains 21% of oxygen and 0.04% of carbon dioxide, while the air we breathe out contains 16.4% of oxygen and 4.4% of carbon dioxide. This is because our cells use oxygen from ...

www.answers.com/Q/What_percent_of_the_air_we_breath_is_oxygen

The amount of oxygen that you breathe in a day is estimated to be about 7.2 kilograms. Twenty-one percent of the air we breathe in per breath is oxygen.

www.answers.com/Q/What_percent_of_oxygen_do_you_breathe_in

The amount of oxygen that you breathe in a day is estimated to be about 7.2 kilograms. Twenty-one percent of the air we breathe in per breath is oxygen.

www.reference.com/science/ingredients-air-breathe-c669aabe151b2439

What Are the Ingredients in the Air We Breathe? The air humans breathe is made up of about 78 percent nitrogen, 21 percent oxygen, and 1 percent carbon dioxide and argon. Trace gases include krypton, methane, neon, helium and hydrogen.

quizlet.com/51728881/emt-b-chapter-9-airway-management-flash-cards

Start studying EMT-B Chapter 9 - Airway Management. Learn vocabulary, terms, and more with flashcards, games, and other study tools. ... What percentage of the air we breathe is made up of oxygen? a. 78% b. 12% c. 16% ... What percentage of oxygen is your patient receiving? 55%.