help with o2 in bloodstream

hi brandon..... well, if u go on the website http://www.lungnet.org.au/fact_sheets/thelungs.html u can get some idea. or here you go:

how does oxygen get into the bloodstream

inside the alveoli, oxygen moves across the paper thin walls of tiny blood vessels, called capillaries, and into the blood, where it is picked up by chemicals in the red blood cells ready to be carried around the body. at the same time, a waste product from the body called carbon dioxide, comes out of the capillaries back into the alveoli, ready to be breathed out.

freshly oxygenated blood is carried from the lungs to the heart which pumps blood around the body through the arteries. once the oxygen has been used up in the tissues of the body, the blood returns, through the veins, to the heart. it is then pumped to the lungs so that the carbon dioxide can be removed and more oxygen taken up.

oxygen and carbon dioxide in the lungs

how does oxygen get to the blood in the first place? we breathe air containing oxygen through the mouth and nose. the air travels down through a breathing tube (the trachea or windpipe) into the lungs. the body's two lungs lie on either side of the heart.

oxygen travels into the smallest air sacs of the lungs, called alveoli. capillaries around these air sacs allow blood to exchange oxygen for unwanted carbon dioxide. the oxygen-rich blood then returns to the heart to be pumped to the rest of the body. the carbon dioxide in the lungs is passed out of the body through the mouth and nose when we exhale

Our RBC contain hemoglobin, which responsible in carrying the O2. O2 attach to the hemoglobin and form oxyhemoglobin, then it is carried to the tissue where O2 got dissociated from the hemoglobin.