Question

Which statement best describes the functioning of the cardiorespiratory system?
-The lungs pump oxygenated blood to the body and remove oxygenated blood from the heart.
-The lungs pump carbon dioxide into the blood and the heart circulates it throughout the body.
-The lungs import oxygen into the blood and remove carbon dioxide from the blood.
-The lungs import carbon dioxide into the blood and the heart circulates it throughout the body.
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Answer 1

The lungs import oxygen into the blood and remove carbon dioxide from the blood. 

Answer 2

Answer:

The lungs import oxygen into the blood and remove carbon dioxide from the blood.

Explanation:

This statement best describe cardiorespiratory functions. Every single cell of our body needs oxygen to live, which is transported trough bloodstream. So, blood have a carrier function, being able to carry oxygen to cells all over the body and to take cell waste (carbon dioxide) to the lungs, where are replaced by oxygen.

Basically, when we exhale, we expelled the waste which is carbon oxide, then immediately we inhale, taking oxygen to complete the cardiorespiratory process.