Which of the following about ventilation/perfusion ratio is wrong? A: normal value in quiet state is 0.84 B: decreasing of ventilation/perfusion ratio means that the alveolar ineffective cavity increases C: ratio in pulmonary bottom is the smallest D: in pulmonary embolism, the ratio increases

What is the difference between nature ventilation and mechanical ventilation?

The disadvantage of district ventilation is that there are many return air shafts and ventilation equipment.

Smoke Exhaust and Ventilation System

中国大学MOOC: Ventilation

should be used to improve local ventilation

5. The characteristics of microcirculation in late shock stage are: A: A. Increased forward resistance and significantly decreased perfusion and slower blood flow through the capillary network. B: B. Increased rear resistance and significantly increased perfusion and slower blood flow through the capillary network. C: C. The microvessels are paralytically dilated, no perfusion and blood flow through the capillary network. D: D. Continuous spasm and contraction of microcirculation.

Dead space like ventilation refer to () A: decrease<br/>of partial alveolar ventilation B: increase<br/>of partial alveolar VA/Q C: increase<br/>of partial alveolar ventilation D: decrease<br/>of partial alveolar VA/Q E: increase<br/>of anatomic shunt

Which<br/>one is not correct about ventilation/ perfusion ratio? () A: the<br/>normal value is 0.84 in resting state B: its<br/>decreasing means the increasing of physiologic dead space C: its<br/>value reaches to 3 at apex of lung D: its<br/>value decreases at inferior part of lung because there is not<br/>sufficient gas exchange there E: when<br/>it undergoes embolism in pulmonary artery, its value decreases

Which of the following is not an advantage of central parallel ventilation?( ) A: The ventilation system is basically independent and safe B: Centralized layout of industrial sites C: Convenient management D: Less coal-pillar loss