A&P Exam IV Flashcards
(239 cards)
What is the purpose of the FEF 25/75 test?
More sensitive test for medium and small airway obstruction
What is the FEF 25/75?
The rate of airflow when the middle half of VC is being expired
Ignores beginning 25% and last 25% of expiration.
If the result of a PFT comes in below the predicted value then the test is considered to be….
Abnormal
If the result of a PFT comes in near the predicted value then the test is considered to be….
Normal
What type of effort is not included in the FEF 25/75?
Dependent
What is a good FEF 25/75 for a patient with asthma?
1000 mL/s
What is another term for FEF 25/75?
Forced Mid Expiratory Flow (FMEF)
What 3 things generate the negative pleural pressure?
- Chest wall
- Lungs
- Diaphragm tone
What does loss of elastin cause?
- Higher lung volumes
- More positive pleural pressure
What is the reason we have a lower lung volume while supine?
Less chest wall recoil in the supine position
Determines FRC
What are the reasons that paralytics cause a decrease in lung volume?
- Decrease tone of diaphragm
- Decrease tone of intercostal muscles
- Decrease outward chest recoil
What controls the rate and depth of breathing?
Medulla in the brainstem
What is the pH in the CSF?
7.31
What percentage of blood gas sensing is controlled by central chemoreceptors? Peripheral?
85% ; 15%
Where are the cartoid bodies located?
Just before the bifurcation of the internal and external carotid arteries
Chest wall recoils…
at FRC
Outwards
How many pairs of carotid bodies are there?
2 pairs
How many aortic bodies do we have?
3-5
How do carotid bodies send information? Aortic bodies?
CN IX (Glossopharyngeal); CN X (Vagus)
The peripheral chemoreceptors are primarily concerned with…
Oxygen
Brain stem (central) chemoreceptors are primarily concerned with…
CO2
H+
also looks at O2
As O2 decreases, carotid body impulses…
increase
As O2 increases, carotid body impulses…
decrease
What control center can we have voluntary control?
respiratory system