The Respiratory System includes the lungs.
millons of alveoli are in the lungs
Lungs contain lots of blood. Blood goes to the lungs to pick up oxygen.
Heart and lungs
to love
lungs
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2
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alveoli
The lungs contain air sacs called alveoli which are surrounded by blood capillaries to allow gaseous exchange.
Human lungs can hold four to six liters of air. The lungs contain about 300 million alveoli. The right lung is slightly larger than the left.