Question

the primary organs responsible for respiration are the
__________.
the diaphragm contracts during
__________
to draw air into the lungs.
the trachea is commonly known as the
__________
the alveoli are tiny air sacs in the lungs that facilitate
__________
exchange.
the bronchi branch into smaller tubes called
__________.
oxygen is transported in the blood by binding to a protein called
__________
the process of breathing out is known as
__________.
the right lung has three lobes, while the left lung has
__________
lobes.
the diaphragm separates the chest cavity from the
__________
cavity.
the
__________
are the small airways that lead directly to the alveoli.
the exchange of gases between the alveoli and the bloodstream is called
__________.
during inhalation, the external intercostal muscles
__________
the ribcage.
the air we breathe in is rich in
__________
, which is essential for cellular respiration

Explanation:

Each answer is based on core human respiratory system anatomy and physiology concepts.

Answer:

1. lungs
2. inhalation (or inspiration)
3. windpipe
4. gas
5. bronchioles
6. hemoglobin
7. exhalation (or expiration)
8. two
9. abdominal
10. respiratory bronchioles
11. external respiration
12. expand (or elevate)
13. oxygen