Mechanics of Breathing (Exam 2) Flashcards Preview

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Flashcards in Mechanics of Breathing (Exam 2) Deck (8)
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1
Q

Inspiration/Inhalation

A

period of time when air is flowing into the lungs
contraction of external intercostals causes ribs to rise and move laterally
contraction of diaphragm causes it to move inferiorly
pulmonary volume increases

2
Q

Expiration/Exhalation

A

passive process that depends on the natural elasticity of lungs
inspiratory muscles relax causing ribs to descend and diaphragm to move superiorly
lungs recoil and pulmonary volume decreases
forced exhalation involves contraction of abdominal muscles and internal intercostals

3
Q

Gas Exchange Physiology

A

O2 and CO2 is exchanged at pulmonary and systemic capillaries via passive diffusion
diffusion occurs at partial pressure gradients

4
Q

Partial Pressure Gradients (PPG)

A

PP- individual pressure exerted by a gas within a mixture of gases (PO2 or PCO2)
G-when PP of a gas differs across a membrane (higher to lower)

5
Q

Elevated pO2

A

polycythemia ro higher density atmospheric oxygen

6
Q

Low pO2

A

anemia or heart decompensation

7
Q

Elevated pCO2

A

pulmonary edema, asthma, or lung obstruction

8
Q

Low pCO2

A

hyper ventilation