You die
You yawn.
The oxygen poor blood (not enough oxygen) goes to the lungs to get more oxygen to turn into oxygen rich blood (has plenty of oxygen)
anemia
it is when you dont have enough blood.
There are many ways. Here are a few: First, obviously, you can not breathe and there would be no air in your lungs. Carbon Monoxide, a deadly gas, can bind to the blood where oxygen is supposed to blind. If you have sickle cell anemia, the hemoglobin in your blood is strangely shaped and therefore oxygen cannot easily bind to it.
You yawn.
Red blood vessels carry oxygen.
When you don't get enough oxygen to your blood, your body may start to show symptoms like shortness of breath, confusion, or bluish lips. It is important to seek medical help immediately, as low oxygen levels can be serious and potentially life-threatening. In a medical setting, supplemental oxygen may be provided to help increase oxygen levels in the blood.
to carry oxygen to your brain so you dont die?
the answer is that i dont know
you are not breathing enough to oxidize your blood
B/c the iron in the blood is what carries the oxygen around the body. With too little iron, not enough oxygen carriers.