2. If they are leaking' there would be large difference when it is block the hole.

4.nope, because the flow rate will get different by the size of the straw, such as Vein and other things.

7.There is large difference between the large size and small size, large size can flow the blood faster and more, but the narrow straw flow the blood slower.

The respiration is a function that sendin oxygen from lung to heart, and then blood vessels. Breathing is a activity for the lungs, the lungs collect all the oxygen in to the lungs through the tracia at the middle of lungs.