Week 2 - Lesson 1 (Part 1) Flashcards
What are 4 differences between arteries and veins?
- Veins are more lateral
- Veins have a thinner tunica media
- Veins collapse
- Veins are larger
- odd shape
What do arteries branch and become?
Arterioles
What do arterioles branch and become?
Capillaries
What do capillaries fuse together to become?
Venules
What do venules fuse together to become?
Veins
When is a blood vessel at the point of an arteriole?
When it branches so much it can no longer be seen with the naked eye
- microscopic
What are the microscopic vessels? (3)
- Arterioles
- Capillaries
- Venules
What are the 3 layers of the artery/vein walls?
- Tunica intima
- Tunica media
- Tunica externa
What is another name for tunica externa?
Tunica adventitia
What vessel has a thicker tunica media?
Arteries
Why do arteries have a thicker tunica media? (3)
- Able to push more blood
- Great elasticity
- Non collapsible
What is the echogenicity of the 3 vessel layers?
- Intima = hyperechoic
- Media = hypoechoic
- Adventitia = hyperechoic
What kind of muscle is in arteries?
Smooth
- there are increasing amounts in the tunica media
What are 2 characteristics of arteries?
- Strong
2. Elasticity
What do arteries deal with?
Surges of oxygenated blood from the heart
What do arteries not have?
Valves
What kind of pressure system are the arteries?
High pressure system
Where does plaque build up in the arteries?
In the inner layers
- this is why we measure the inner walls of the hyper echoic lines to the outer of the hypo echoic lines
What does the elasticity of arteries allow?
Allows the arteries to expand and contract
What kind of pressure system are in veins?
Low pressure
What 3 vessels return deoxygenated blood back to the heart?
- IVC
- lower body - SVC
- upper body - Tributaries
What does the venous circulation contain?
Valves
Where are there more valves?
In the venous system that is more distally
Which vessels have larger lumens?
Veins
Which vessel has the largest diameter?
Veins
Which vessels are easier to stick with a needle and extract blood?
Veins
What does it mean if you have a thinner vessel?
Less innervation
- less painful to stick with a needle
What happens with the blood in a vein if you stick a needle with it?
Blood will not typically seep out much through your injection site
Which vessel stores blood?
Veins
- and is readily available
