Respiration Physiology
Terms
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- 4 Minimum Effort Criterium for "choosing" what respiratory muscles to use
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1. Mechanical advantage
2. Assistance or opposition of the environment
3. muscle mass
4. relationship between thoracic volume change and muscle length - Spirometry
- measures the volume exchanged between the body and the atmosphere. deep breath in then exhale completely
- FRC
- functional residual capacity
- ERV
- expiratory reserve volume- quantity of air that can still be expired after resting expiration
- REL
-
resting expiratory end level
both resting and speech breaths end at this level about 40% VC - VC
- vital capacity= ERV+IRV+TV
- qualities of resting respiration
-
12-15 cycles per minute
same time to inspire and expire
10% of VC
at REL Palv= Patm
Palv variations of +- 2cm H20 - qualities of speech respiration
-
pressure does not vary much over time 10cm H2O
10% insp 90% exp
IEL higher for speech
50-70% VC - Hooke's Law
- F=ks(change Length)
- Boyle's Law
- P*V=k
- Elasticity of Resp system comes from 4 places...
-
1. Costal cartilages
2. tissue that form the lungs
3. connective tissues in the thoracic walls
4. surface tension of the alveoli (most important) - TLC
- Total lung capacity= RV+ERV+TV+IRV
- Max Palv pressure at 100% VC
-
130 cm H2O
*no less than zero
*before a sneeze - Min Palv pressure at 0% VC
-
-110 cm H2O
*no more than zero
*before a hiccup