the mechanical movement of air into and out of the lungs.

the exchange of gases between the atmosphere and the blood.

the exchange of gases between the blood and the body’s cells.

Air moves through the larynx to a tube in the chest called the

The trachea branches into two large tubes, called

Branching continues until each branch ends in an air sac called an

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respiratory system

none of yo bizness

Question	Answer
Breathing	the mechanical movement of air into and out of the lungs.
External respiration	the exchange of gases between the atmosphere and the blood.
Internal respiration	the exchange of gases between the blood and the body’s cells.
trachea	Air moves through the larynx to a tube in the chest called the
bronchi	The trachea branches into two large tubes, called
lungs	The bronchi lead to the
alveolus	Branching continues until each branch ends in an air sac called an