Trace a red blood cell from the ascending aorta, through a capillary bed in the left knee, and back through the heart and lungs to the ascending aorta. At each step, name the vessel the red cell is passing through and whether it is currently oxygenated or deoxygenated.

I can answer this for you, cool1, but sense it is a homework assignment and entirely not appropriate for me to help you with it here on AMHD. Hit the books and find out, it is much more enjoyable to learn something like this, and remember it instead of asking someone to do it for you. I think having this knowledge about our human bodies is so exciting.
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