【正文】
而且擴散膜兩側(cè)的 O2和CO2分壓隨細(xì)胞代謝的強度和組織的血流量而異。 肺容量是指肺容中兩項或兩項以上的聯(lián)合氣量 Pulmonary ventilation volume and alveolar ventilation volume ? Minute ventilation volume *12~*18 6~9 L/min , maxmum 70~150 L/min ? Dead space and alvoelar ventilation anatomical dead space physiological dead space alveolar ventilation Gas Exchanges The principle of gas exchages ? Factors affecting diffusion rate partial presure difference △ P solubility of gas S area available for dissusion A temperrature T distance to diffuse(thickness of the diffusion barrier) d molecular weight of gas MW △ P 肺通氣的阻力 肺通氣的阻力有兩種: 彈性阻力( 70%),包括肺的彈性阻力和胸廓的彈性阻力 非彈性阻力( 30%),包括氣道阻力等 彈性阻力和順應(yīng)性( Compliance) C= ?V/?P (L/cmH2O) 肺表面活性物質(zhì)( pulmonary surfactant) 是復(fù)雜的脂蛋白混合物,主要成分是二軟脂酰卵磷脂( DPPC)和表面活性物質(zhì)結(jié)合蛋白( SP)。5 Respiration Chemical reduction of molecular oxygen to form water is the primary source of energy for animals. The principal 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。 Expiratory movement 呼吸運動的形式: 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 2~ 1 mmHg (~ ) 呼氣時 1~ 2 mmHg (~ ) 用力呼吸 (forced breathing) 用力吸氣 100~ 30 mmHg 用力呼氣 60~ 140 mmHg The pre