In What Way, If Any, is the Circulatory System of Humans

Question

In what way, if any, is the circulatory system of humans important to the process of gas exchange?
A)It has no importance to gas exchange.
B)It allows air to be taken into the lungs.
C)It increases the area available for gas exchange.
D)It carries oxygen to cells that are not in direct contact with air.

Accepted Answer

The circulatory system carries oxygen from the lungs to the body's cells that are not in direct contact with air (such as those in muscles and organs). Without the circulatory system, oxygen would not be able to reach all parts of the body in sufficient amounts for proper functioning. Therefore, it is important to the overall process of gas exchange in the body.