Term
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Definition
The plural of alveolus. The alveoli are tiny air sacs within the lungs where the exchange of oxygen and carbon dioxide takes place.
The plural of alveolus. The alveoli are tiny air sacs within the lungs where the exchange of oxygen and carbon dioxide takes place.
The plural of alveolus. The alveoli are tiny air sacs within the lungs where the exchange of oxygen and carbon dioxide takes place. |
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Term
| How many alveoli are there per young and what purpose do they serve? |
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Definition
| there are about 150million per lung to increase surface area. Aleveoli are neededfor gas exchange (02 into blood co2 leave aveoli into blood for CO2 exhalation). |
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| What are alveoli surrounded by? |
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Definition
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Term
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Definition
| Pleural of pleura (the thin covering that protects and cushions the lungs). |
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Term
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Definition
| the thin covering that protects and cushions the lungs |
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Term
| what are the two pleurae called? |
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Definition
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Term
| I adhere to the diaphram, and the medianstinum and to the inter surfae of the ribcage. What am I? |
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Definition
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Term
| What is the space between the visceral & parietal pleura's? |
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Definition
| The pleural cavity: The space enclosed by the pleura, which is a thin layer of tissue that covers the lungs and lines the interior wall of the chest cavity. |
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Term
| what are functions of the pleura fluid (3) |
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Definition
| 1) prevent friction 2) creat pressure gradient 3) compartmentalize |
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Term
| What is atmospheric pressure? (number) |
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Definition
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Term
| What is atmospheric pressure? (number) |
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Definition
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Term
| How do you change the pressure of a gas? |
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Definition
| Change the volume of its container: lover volume= higher pressure. higher volume = lower pressure |
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Definition
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Term
| no quesstion, just read out loud. |
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Definition
| Air, like other gases, flows from a region with higher pressure to a region with lower pressure. Muscular breathing movements and recoil of elastic tissues create the changes in pressure that result in ventilation. Pulmonary ventilation involves three different pressures: |
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Term
| What does the phrenic nerve do in realtion to inspiration? |
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Definition
| the phrenic nerve stimulates the diaphragm to flatten |
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Term
| what is another name for inhalation and what process takes place? |
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Definition
| Inspiration (inhalation) is the process of taking air into the lungs. It is the active phase of ventilation because it is the result of muscle contraction. During inspiration, the diaphragm contracts and the thoracic cavity increases in volume. This decreases the intraalveolar pressure so that air flows into the lungs. Inspiration draws air into the lungs. |
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Term
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Definition
| phrenic nerve stimulates the diaphragm to flatten. intercostal uscle expand in ribcage (deep inhalation uses other muscles |
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Term
| What is interpeural space? |
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Definition
| The potential space between the visceral and parietal pleurae is called the intrapleural space |
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Term
| what is interpleural pressure |
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Definition
thepressure between pleural membranes.
*is at -4 mm Hg below atmospheric pressure.
*keeps lungs inflated |
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Term
| parietal pleura clings to |
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Definition
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Term
| visceral pleural cling to |
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Definition
| parietol pleura - also pulled out |
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Term
| lungs also pulled out (lungs expand) adn the intrapulmonary pressure |
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Definition
| (pressure inside lungs) decreases -3mm below atmospheric pressure |
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Term
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Definition
gas also expands when heated, helps lungs exxpand.
when respiratory muscles stop contracting air enters lungs, pressure in lungs = atm pressure then inflow stops |
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Term
| passive process - no energy required. done by elasticity (elastic recoil) of lungs and rib cage. As recoil occurs volume decreases, pressure in lungs increases to +3mm Hg and then air exits |
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Definition
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Term
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Definition
| the process is active (energy needed) - more muscles used |
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Term
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Definition
| air in the pleural cavity due to puncture or lung damage. lots of negative pressure with in pleural cavity. can result in collapsed lung. |
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Term
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Definition
between pleurae.
at rest -4mm Hg
During inspiration -6mm Hg |
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Term
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Definition
inside lungs
during inspriation -3mm Hg
during expiration +3mm Hg |
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