Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Pulmonary Vent
| Question | Answer |
|---|---|
| surfactant | reduces surface tension of alveolar fluid that locks shape in place, produced by type II alveolar cells |
| physical factors influencing pulmonary ventilation | air way resistance, alveolar surface tension, lung compliance; they affect the ease of air passage and amount of energy required for ventilation |
| tidal volume (TV) | amount of air moved into and out of lungs with each breath, averages -500ml |
| inspiration | gases flow into lungs |
| inspiration | chest expands, diaphragm contracts, lungs stretch |
| expiration | gases exit lungs |
| expiration | chest contracts, diaphragm relaxes |
| expiration | volume decreases pressure increases |
| inspiration | volume increases pressure decreases |
| atmospheric pressure (Patm) | pressure exerted by air surrounding the body, 760mm Hg at sea level=1atm |
| intrapulmonary pressure (Ppul) | intra-alveolar pressure, fluctuates with breathing, always equalizes with Patm |
| rule 1 | volume changes lead to pressure changes, p increases V decreases= p decreases v increases |
| rule 2 | pressure changes allow flow of gases to equalize pressure |
| Boyle's law | relationship between pressure and volume of a gas, pressure varies inversely with volume |
| quiet inspiration | active process involving inspiratory muscles |
| quiet inspiration | diaphragm contracts, external intercostals contract |
| result of quiet inspiration | in thoracic cavity and intrapulmonary pressure drops by 1mm Hg (Ppul←Patm) and air flows into lungs down pressure gradient until intrapulmonary pressure is 0 |
| forced deep inspiration | active process from vigorous exercise or COPD and accessory muscles activated |
| forced deep inspiration | external intercostals contract, diaphragm contracts |
| result of forced deep inspiration | all act s to further increase thoracic cage size, creating a larger pressure gradient so more air flows into lungs |
| quiet expiration | passive process in heath individuals |
| quiet expiration | inspiratory muscles relax, diaphragm relaxes, external intercostals relax |
| result of quiet expiration | thoracic cavity volume decreases then lungs recoil, volume decreases causing intrapulmonary pressure to increase by +1mm Hg (Ppul→Patm), air exits lungs |
| forced deep expiration | active process accessory muscles are activated |
| forced deep expiration | internal intercostals contract, obliques contract, transverse abdominal contracts |
| result of forced deep expiration | lungs empty more air than normal and decreases thoracic volume |
| airways resistance | size of airways |
| alveolar surface tension | with or without surfactant |
| lung compliance | measure of change in lung volume that occurs with given change in transpulmonary pressure, stretchiness |
Created by:
brookeklinger
Popular Biology sets