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What is the name of the two structures that branch from the trachea leading to the lungs?
bronchi
lungs
involuntary
lung
carbon dioxide
expand and draw in air
diaphragm
brain
The lungs expel air when the ______ relaxes.
bronchi
lungs
involuntary
lung
carbon dioxide
expand and draw in air
diaphragm
brain
What gas do animals breathe out during respiration?
bronchi
lungs
involuntary
lung
carbon dioxide
expand and draw in air
diaphragm
brain
In the respiratory system, which organs are responsible for removing carbon dioxide from the bloodstream?
bronchi
lungs
involuntary
lung
carbon dioxide
expand and draw in air
diaphragm
brain
The expanding and contracting of the lungs is ______.
bronchi
lungs
involuntary
lung
carbon dioxide
expand and draw in air
diaphragm
brain
The ______ keeps the heart pumping and the lungs breathing autonomically.
bronchi
lungs
involuntary
lung
carbon dioxide
expand and draw in air
diaphragm
brain
The lungs ______ when the diaphragm contracts.
bronchi
lungs
involuntary
lung
carbon dioxide
expand and draw in air
diaphragm
brain
Which of the following is a major organ of the respiratory system?
bronchi
lungs
involuntary
lung
carbon dioxide
expand and draw in air
diaphragm
brain
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