CVR 23 ventilation Flashcards
What are the processes of ventilation
external - exchange of oxygen and c02 between body and external environement
Internal - uptake of oxygen by cells and release of c02
Intracellular takes plaec where
mitochondria
What is the mucoculiary clearance system
below larynx, protecting by trapping and removing inhaled pathogens with cilia and mucus and moving in coordinated wave like movements
Contents of extra and intra thoracic
extra - nasals, mouth, pharynx, larynx, trachea
What does the larynx do?
ensures air travels to the lung and not the stomach
What is ficks law of diffusion?
the greater the surface area and the shorter the distance the greater the rate of diffusion
dimensions of alveoli
.2 mm 300 million in lungs surface area of 80 m2
How does gas move in the alveoli
diffusion
How long does it take to reach equilibrium
1 sec
Boyles law
BOYLE’S LAW:
“For a fixed mass of enclosed gas at constant temperature, the product of the pressure (P) and volume (V) remains constant.”
Which is greater pleural or pulmonary pressure
pulmonary pressure
8 events of inspiration
muscles contract diameter of thoracic cage increases intrapleural pressure goes negative trnasmural pressure increases causing alveoli to open infra alveoli pressure falls air flows tidal volume is added to resting volume equilibrium
Name the primary inspiratory muscles
diaphragm and external intercostals
Name the air way inspiratory muscles
laryngeal, pharyngeal and genioglossus
What happens to the diaphragm?
Dome shaped, flattens upon contraction and descends. Intercostals lift ribs up and out
