Smoking damages the flexible air sacs, or alveoli, that help the lungs absorb oxygen and remove carbon dioxide when a person breathes in and out, the American Lung Association states. Damaged air sacs gradually lose flex... More » Health

Within 20 minutes after an individual quits smoking, the body starts to derive benefits, according to Healthline. Heart rate, blood pressure, circulation and many other bodily functions improve. More » Health

Negative effects of smoking include harm and damage to bodily organs and the body's systems, explains the National Cancer Institute. Smoking diminishes overall health and can cause cancers of the mouth, throat, kidney, b... More » Health
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According to HowStuffWorks, humans who breathe 100 percent pure oxygen can experience several negative affects, including accumulation of fluid in the lungs, chest pain and slowed gas flow across the alveoli, which cause... More » Health Medications & Vitamins Side Effects

The actual sites of gas exchange within the lungs are within tiny air sacs called alveoli. They are found at the end of the bronchial tubes. More » Science Human Anatomy

The exchange of carbon dioxide and oxygen occurs in the alveoli of the lungs. Oxygen is taken into the body through the process of inhalation while carbon dioxide is eliminated through exhalation. More » Science Human Anatomy Organs

Bronchioles are tiny airways that carry oxygen to alveoli, or air sacs, in the lungs and help stabilize breathing in the respiratory system, according to Bronchioles are lined with smooth muscular walls that c... More » Science Human Anatomy Organs