Gas exchange occurs in the alveoli of the lungs.

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Presentation transcript:

KEY CONCEPT The respiratory system exchanges oxygen and carbon dioxide.

Gas exchange occurs in the alveoli of the lungs. Oxygen and carbon dioxide are carried by the blood to and from the alveoli. oxygen diffuses from alveoli into capillary oxygen binds to hemoglobin in red blood cells carbon dioxide difuses from capillary into alveoli ALVEOLI GAS EXCHANGES alveolus capillary co2 o2 Co2 diffuses into alveolus. O2 diffuses into blood. capillaries

Gas exchange occurs in the alveoli of the lungs. Breathing is regulated by the brain stem. midbrain pons medulla oblongata spinal chord

Respiratory diseases interfere with gas exchange. Lung diseases reduce airflow and oxygen absorption. Emphysema destroys alveoli. Asthma constricts airways. Cystic fibrosis produces sticky mucus.

Smoking is the leading cause of lung diseases.

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