Inhalation and Exhalation Flashcards
What is pressure ?
The force created by movement and collision of gas molecules
What muscles are involved in quiet Inhalation ?
External intercostal muscles
Scalenes
Pectorias minor
Stemocleidomastoid
When alveoli pressure is negative, air flows inside lungs. TRUE or FALSE ?
TRUE
Name 2 forces that equalise pressure in the lungs…
1) Elastic recoil
2) Active muscular and Passive gravity
What is Intrapulmonary Pressure ?
The pressure inside the lungs achieved by increase in the volume of the lungs
What are the two determinants of Lung compliance ?
1) Surface tension
2) Elasiticity
Name 3 way the THORAX increases …
1) Verticically
2) Transversally
3) Anter-posterior
What is the equation for lung compliance ?
Change in lung volume/transpulmonary pressure
What is Interplueral Pressure ?
How much pull there is on Interpleural fluid when the muscles ad ribs expand and pull on the tissue
Accessory respiratory muscles are activated when respiration increases significantly. TRUE or FALSE ?
TRUE
What is Charles’ law ?
The pressure of gas is directly related to the absolute temperature
What is Henry’s law ?
The amount of gas that dissolves in a liquid is based on the pressure of the gas and solubility of the gas in the liquid
What is Dalton’s law ?
The pressure of a gas mixture is the sum of the pressure of the individual gases
What is Boyle’s law ?
The pressure exerted by a gas is inversely proportional to its volume
Describe the events of Exhalation ?
1) Signals aren’t set from the brain to the Phrenic nerve
2) Diaphragm doesn’t contract
3) Thoracic cavity volume increases and its pressure decreases
4) Air flows out of lungs
