Test 3 Flashcards
What’s does the aveolar defense do
Alveolar macrophages ( big eaters)
Traits: eat dustWhat’s the pathway of O2 from alveoli
Alveoli—-> blood—-> RBC
What’s the pathway of CO2 from alveoli
RBC—-> blood—-> alveoli
What is surfactant
Respiratory surfaces are thin and moist
Surfactant prevents sticking
- detergent breaks surface tension of water
- allows alveoli to inflate
- produced by pneumocyte 2When is the diaphragm up?
When relaxed
When is the diaphragm down?
When contracted
What are pleura membrane
Membrane that encases pleural cavity
Membrane that wraps the lungs are called?
Visceral plureal
Membrane that wraps body wall is called?
Parietal pleural
What is pleural cavity
It’s potential space, pleura stick together
What happens when pressure outside the body and inside the body are equal
No air movement occurs
When does volume decrease in the lungs
Pressure outside
When does volume increase in the lungs
Pressure outside > pressure inside
If pressure inside the body rises what happens to air flow
Air flows out
What happens if pressure falls inside the body
Air flows in
When does pneumothorax occur
When the lungs collapsed
What happens during a Collasped lung
Hole in parietal pleura allows pleura cavity to fill with air
- no longer potential space but an actual space - air flows in - lungs recoil
What happens when the lungs recoil
Alveoli can’t open
Pressure in pleural cavity is too great
What’s the characteristic of voluntary control of breathing
Conscious effort
What’s the characteristic of involuntary control of breathing
Breathing regulated by ANS & respiratory control center in medial oblongata
Chemoreceptors in arteries monitor CO2, O2, H+ concentration
High CO2 and H+ triggers reflex to increase breathing
What precent of CO2 is bound to Hb
23%
What precent of CO2 is dissolved in blood plasma
7%
What percent of CO2 is converted to biocarbonic fluid
70%
Carbonic acid is a reaction that occurs were
In RBC
