The main purpose of the cardiovascular system is to pass the blood through the lungs, where it picks up oxygen, then to move it on to all parts of the body, where the oxygen is released and utilized.
(The main purpose of the cardiovascular system; is; to pass the blood through the lungs, where it picks up oxygen, then to move it on to all parts of the body,) (the oxygen; utilized; ) (it; picks up then; oxygen) (the oxygen; is released; )
The main purpose of the cardiovascular system the oxygen it the oxygen
is utilized picks up then is released
to pass the blood through the lungs, where it picks up oxygen, then to move it on to all parts of the body,
oxygen