【正文】
Chapter 6 Hypoxia 絕食 14天 絕水 7天 絕 O2 數(shù)分鐘 O2 是人體的第一生命物質(zhì) 。 攝取 攜帶 運(yùn)輸 利用 O2 O2 Concept Hypoxia can be defined as deficiency in either the delivery or the utilization of oxygen at the tissue level, which can lead to changes in function, metabolism and even structure of the body. 或 機(jī)能、代謝、形態(tài)結(jié)構(gòu)異常 氧利用障礙 組織中毒或損傷 氧的攝取、攜帶、運(yùn)輸障礙 組織供氧不足 Parameters of blood oxygen 1. partial pressure of oxygen, PO2 物理溶解于血漿中的氧所產(chǎn)生的張力 血液運(yùn)載 O2的方式 物理溶解形式 化學(xué)結(jié)合形式 % % PO2 is the tension produced by oxygen molecules physically dissolved in plasma. ◣ Partial pressure of inspired oxygen (吸入氣氧分壓, PiO2 ) ◣ Partial pressure of oxygen in the alveoli (肺泡內(nèi)氧分壓, PAO2 ) Acting factor PaO2: 100 mmHg ( ) PvO2: 40 mmHg ( ) Normal value 2. oxygen binding capacity, CO2max 100ml血液中 Hb所能結(jié)合氧的最大毫升數(shù) Maximal amount of oxygen that can be potentially bound by the haemoglobin is called oxygen binding capacity of haemoglobin. Hb concentration and quality Acting factor Norma