Oxygen in the atmosphere is renewed by photosynthesis provided by green plants. This process converts carbon dioxide back to oxygen and complex carbon compounds like sugar.
oxygen
No it isn't. It is Nitrogen, which makes up 70% of the air we breathe.
The amount of oxygen in the air
The lower the percentage of oxygen air contains, the more frequent a breath must be taken in order to maintain the blood oxygen level at an acceptable level.
When you inhale air the concentration is abut 21% of oxygen but in your lungs some of it gets consumed and replaced by carbon dioxide the concentration of exhaled oxygen depends on your metabolism and oxygen consumption.
Veins carry oxygen depleted blood to the heart.
Air is 20.5 percent oxygen.
What do you think will happen to animals and humans if the amount of oxygen in the air is reduced?
Hypoxia is the term used for low, or depleted, oxygen levels. It occurs naturally at high altitudes or in the deeper regions of the sea.
hypoxia
You don't use all of it but you do use a lot of it i am not 100% certain how much you use though
no effect
air
Air is mostly made up of nitrogen. Oxygen is the second largest amount in air. Carbon dioxide is the third largest amount in air. Hope this helps!
The term oxygen debt was adopted to explain anaerobic energy expenditure following intense physical exercise. The amount of oxygen required to reoxidize the lactose acid manufactured as well as to restock depleted ATP stores.
when you inhale air into your lungs the concentration of oxygen in the blood can be no greater than that in the air.As the blood reaching the lungs is lower in oxygen there is transfer from the air to the blood stream until the concentrations stabilise.However there is no active transfer.Therefore there will always be Oxygen in exhaled air even if the initial oxygen concentration in the blood is zero as the air oxygen and the blood oxygen will reach a steady state equilibrium
oxygen