Save
Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
share
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

MP - Lecture 28

Pulmonary Circulation

QuestionAnswer
Medical Physiology – Lecture 28 Pulmonary Circulation
Left atrial pressure is estimated by: Pulmonary wedge pressure
Pulmonary vascular resistance is ___ than systemic resistance. Much lower
Pulmonary vascular resistance has ___ regulation. Little autonomic (autoregulation)
If pulmonary arterial pressure increases, pulmonary vascular resistance ___ and flow ___ substantially. Decreases, increases
In the lung, small pressure change results in: Large cardiac output change
A large increase of flow in the lung produces: small change in pulmonary arterial pressure
In the brain, flow is: constant over a wide range of arterial pressures (autoregulation)
In tissues that autoregulate, increases in pressure produces: Small changes in flow and increased resistance
Lung regulation is done by two passive mechanisms: Recruitment and distension
Gravity causes pressure to ___ as you go up the lungs. Decrease
Zone 1 of Lung No flow
Zone 2 of Lung Low to moderate flow
Zone 3 of Lung High flow, high pressure
Hypoxic Vasoconstriction Low alveolar PO2 triggers local vasoconstriction to divert blood to better ventilated parts of lung
Hypoxic vasoconstriction occurs only in: Pulmonary circulation
Resistance is at a minimum when: Lung volume = FRC
Effect of lung volume on pulmonary vascular resistance: Increase or decrease in lung volume increases vascular resistance
Pulmonary vascular resistance increases with lung volume decrease or increase because: Alveolar and extra-alveolar pulmonary blood vessels
Alveolar Blood Vessels Capillaries and small arterioles and vessels
Extra-Alveolar Blood Vessels Larger arterioles, arteries, and veins
Lung volume increase causes alveolar vessels to: Stretch, increasing resistance
Lung volume decrease causes extra-alveolar vessels to: Decrease radial traction, increasing resistance
An increase in alveolar resistance or extra-alveolar resistance causes overall resistance increase because: Pulmonary vessels are in series
Hydrostatic Pressures of Pulmonary Capillaries Lumen = 7, ISF = -8
Colloid Osmotic Pressure of Pulmonary Capillaries Lumen = 28, ISF = 14
Net driving force of pulmonary capillaries: +1 outward (towards ISF)
Capillary lumen leaks fluid through ___ to ___. Endothelial layer to ISF
ISF edema’s effect on gas exchange is: Minimal, diffusion distance still small
Alveolar edema’s effect on gas exchange is: Severe impairment, fluid occupies space where O2 normally does
Causes of pulmonary edema: Increased capillary hydrostatic pressure (left heart failure), capillary permeability increase (poison gas), loss of pulmonary surfactant, high altitudes, lymphatic insufficiency, and heroin overdose
Pulmonary circulation removes: Serotonin, prostaglandin E2/F2a, and leukotriene
Function of ACE in pulmonary metabolism: Convert angiotensin I to angiotensin II and deactivate bradykinin
Created by: emyang
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards