Blood in the pulmonary vein is oxygen rich, while in all of the other veins, it is oxygen poor.
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Answer: Here are the rules of pivoting in basketball: You can rotate around your pivot foot. You can not lift your pivot foot off the floor until you shoot, pass, or begin dribbling the ball. You can not hold onto the ball for longer than five seconds.
The main factor that controls the rate of breathing is..
A.) concentration of carbon dioxide.
If we think about it.. When we breath in oxygen, right away it enters your lungs and turns into carbon dioxide. Well since your lungs need to process oxygen and bring oxygen into the blood stream. Then as soon as the oxygen comes inside (inhale) the oxygen turns into carbon dioxide and you breath it out (exhale) to get a new oxygen load.
Makes sense? lol
Good Luck! :)
