Week 2 - Lesson 1 (Part 2) Flashcards
What do valves do? (3)
- Prevent back flow
- Storage for the blood
- Helps blood get back to the heart
What kind of diameter is there when valves are locked?
Wider diameters
When should the valves be locked into place?
When you are not moving
- sitting or standing
When should the valves be open?
As you move the muscles will contract and the blood gushes
- opening the valves
When is back flow prevented?
During diastole
What forces the valves to open?
Momentum during systole
- muscle contraction
When do valves close?
When momentum decreases
- at rest
What happens to the thoracic pressure when blood moves forward into the right atrium?
It decreases
With spectral doppler, what does it look like when you have a more venous pulsatile flow?
More defined peaks and troughs
Where do you get more venous pulsatile flow?
When you are closer to the heart
What is an example of venous pulsatile flow?
Hepatic veins
What are examples of venous flow that is slightly further away from the heart? (2)
- Common femoral veins
2. Common iliac veins
What is an example of venous flow that is distal?
Popliteal vein
What does distal venous flow look like?
Relatively flat with few smooth bumps, continuous flow
Why does arterial flow differ?
Because it depends on the vascular bed being supplied
What is an example of low arterial resistance flow?
In the brain
What does low arterial flow look like on a spectral doppler?
Lower peaks
What kind of vascular bed do brains have?
Low
What is an example of high arterial resistance flow?
Femoral artery
Why is the femoral artery an example of high arterial resistance flow?
Because it doesn’t need blood flow continuously
- exercise is the exception
Why is the brain an example of low arterial resistance flow?
Because it is always is working and always needs blood flow
What does high arterial flow look like on a spectral doppler?
Higher peaks
- more pulsatile
What kind of vascular bed does the femoral artery have?
High
What do veins do?
Carry blood to the heart
Do veins have a pulse?
No
Where are veins located?
Near the surface of the skin
What do arteries do?
Carry blood away from the heart
Do arteries have a pulse?
Yes
Where are arteries located?
Deeper under the skin
