During expiration, carbon dioxide moves from the ______ to the ______.

This substance, produced by the cells of the respiratory system, traps inhaled particles and bacteria.

Check all of the following that are true about inspiration.

The purpose of respiration is the provide oxygen for cellular respiration and remove carbon dioxide waste from cellular respiration. 

Check all of the following mechanisms that allow blood to move through the veins to return to the heart. 

__________ pushes blood out of the capillaries. __________ brings blood back into the capillaries

Cellular respiration produces which of the following for our body’s cells?

In two to three sentences, contrast external respiration from internal respiration. 

A deficiency in thyroid hormone could cause which of the following due to a slower metabolism. 

These microscope structures are the sites of gas exchange in the lungs?