10. the systemic circuit provides for the exchange of gases between the blood and the lungs. true false

In the body we split our circulatory system into two different circuits. The systemic circuit is responsible for circulating oxygenated blood and nutrients throughout your body using, arteries (blood vessels that transport blood away from the heart), and deoxygenated blood back to the heart via veins (blood vessels that transport blood back to the heart).

There is one other circuit involved, though, which is responsible for transporting deoxyenated blood via pulmonary arteries (remember arteries always transport away from the heart), to the lungs to be reoxygenated, before coming being brought back to the heart via pulmonary veins to be redistributed. This is known as the Pulmonary Circuit. It is an interesting subject as it is one of two exceptions wear veins transport oxygenated blood, while arteries transport deoxygenated blood, the other being the umbilical vasculature in newborns. 

Hence your answer is False.

Ibelieve the answer is c.

Because without physical activity, the body has extra "energy" if you will, and so when it is time for bed you are not tired, so you end up staying up all night. also there is probably an effect on your internal clock, which messes with your melatonin production which goes hand in hand with your sleep cycle