Respiratory System
In the lungs, oxygen enters tiny capillaries, where it combines with hemoglobin in the red blood cells and is carried to the tissues. Inhaling draws into the lungs air that is higher in oxygen and lower in carbon dioxide; exhaling forces from the lungs air that is high in carbon dioxide and low in oxygen. Changes in the size and gross capacity of the chest are controlled by contractions of the diaphragm and of the muscles between the ribs.
- respiratory system [risˈpaiərətəri - ˈsistəm] n.呼吸系统
- lung [lʌŋ] n.肺
- hemoglobin [ˌhi:məuˈɡləubin] n.血色素
- inhale [inˈheil] v. 吸气
- exhale [eksˈheil] v. 呼气
- gross capacity [ɡrəus - kəˈpæsiti] n. 总容量
- chest [tʃest] n. 胸腔
- diaphragm [ˈdaiəfræm] n. 隔膜
- rib [rib] n.肋骨
