Respiration Mechanics Flashcards
(27 cards)
What is respiration?
Tissue Respiration- Aerobic metabolism in cells
Breathing- Gas exchange and the associated processes
What is ‘Respiratory mechanics’?
-Study of the mechanical properties of lung and chest wall
-Process by which air enters and leaves the lungs
Why is respiratory mechanics important?
-To understand how lungs work normally and in disease states
-Almost all lung diseases affect mechanical properties of lung
What maintains blood gas homeostasis?
Breathing
At rest, what is the usual average amount of PO2 and PCO2?
100 +-2 mmHg and 40+-2 mmHg
What happens during severe exercise?
Lactic acid formation, amount of 02 consumed is less than amount of CO2 given out.
5000ml O2/min, 6000CO2/min
What are the functions of the upper airways? (above larynx)
Conduct air to lung
Humidify
Warm (body temp)
Filter (cleaning debris)
What epithelium is the upper airways to bronchioles lined by?
Pseudostratified ciliated columnar epithelium
What are the purpose of goblet cells in airways?
Inhaled particles stick to the mucus. Filtering the air
Why is it important to remember normal pattern of breathing in clinical setting?
Different anaesthesia’s react differently
What type of process is taking a breath in?
Active Process
How is a breath triggered?
By brain sending impulse to diaphragm to contract
What type of process is expiration?
Passive Process
What happens during strenuous exercise to expiration process?
Becomes active
When may expiration become Active for a patient?
Respiratory Diseases
What is the intrapulmonary pressure?
Pressure within the lung
What is the tidal volume?
The amount of air took in after each breath, usually 500ml
What is the pressure of the space between the lung and the chest wall called?
Pleural Pressure
What is the difference of pressure between lungs and the space between lungs and chest wall called?
Transpulmonary pressure
What is the pressure in the lung also known as?
Alveolar Pressure
What is the alveolar pressure at beginning of inspiration?
0, no flow
What is barometric pressure?
Pressure outside the lung
When does inspiration end?
Alveolar pressure=Barometric pressure
In healthy lungs which level of breathing is most efficient?
Low level
1ml of o2/litre of air breathed
