動(dòng)物生理學(xué)5呼吸系統(tǒng)生理上-展示頁(yè)
2025-05-25 17:17本頁(yè)面
【正文】 al site for the reaction occurs within the mitochondria. Without this reaction life cannot exist for more than seconds. Coincidental with the reduction of O2 is the production of CO2。 this es mainly from oxidative phosphorylation of glucose which also occurs principally in the mitochondrion. Repiration includes: ? The gases must be moved between the environment and the lungs, usually referred to as “pulmonary ventilation” ? The gases must be exchanged between the spaces in lung and the blood ? Exchange of gases between the blood and the various tissues must occur ? Finally transfer of gases must occur within the tissue to sites of utilization (for O2 ) and from the sites of production (for CO2) pulmonary ventilation Gas exchange between the environment and the lungs, usually referred to as “pulmonary ventilation” The structures needed for pulmonary ventilation: airway, alveoli [230。 Expiratory movement 呼吸運(yùn)動(dòng)的形式： 腹式呼吸和胸式呼吸 平靜呼吸和用力呼吸 Intrapulmonary pressures 肺內(nèi)壓 平靜呼吸 吸氣時(shí) 2~ 1 mmHg (~ ) 呼氣時(shí) 1~ 2 mmHg (~ ) 用力呼吸 (forced breathing) 用力吸氣 100~ 30 mmHg 用力呼氣 60~ 140 mmHg The pressure in thoracic cavity (intrapleural pressures) 胸膜腔內(nèi)壓 ? pulmonary ventilation: As long as interplueral pressure remains less than atmospheric pressure, the dimensions of the lungs follow closely the dimensions of the thoracic cavity. Lung movements results from contraction of respiratory muscles associated w
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