Cardiovascular system- blood vessels/blood pressure Flashcards
What are the 3 types of blood vessels
- Arteries 2. Veins 3. Capillaries
Transport blood away from the heart
Arteries
Transport blood toward the heart
Veins
Allow exchange of materials between blood and surrounding tissues
Capillaries
Layers of blood vessel walls
Tunics
What are the 3 layers of tunics
- Tunica intima 2. Tunica media 3. Tunica externa
Innermost layer of blood vessel wall
Tunica intima
middle layer of blood vessel wall
Tunica media
outermost layer of blood vessel wall
Tunica externa
The tunica intima is composed of
endothelium (mostly simple squamos)
The tunica media is composed of
smooth muscle
The tunica externa is composed of
areolar CT
Inside space of blood vessel
Lumen
_____ have thicker tunica media, narrower lumen, and more elastic and collagen fibers
arteries
Why do arteries have more elastic and collagen fibers
Higher pressure is placed on them
_______ have ticker tunica externa, wider lumen, and less elastic and collagen fibers
Veins
What do veins have to prevent backflow of blood
valves
______ walls consist only of tunica intima layer
capillaries
Arteries get
progressively smaller as they lead into capillary beds (carry blood away from heart)
What are the 3 types of arteries from largest to smallest
- Elastic arteries 2. Muscular arteries 3. Arteriols
Move blood from the heart to smaller arteries and have lots of elastic fivers that allow them to stretch
Elastic arteries
Distribute blood to specific regions and organs and have thickest tunica media
Muscular arteries
Smallest arteries that feed into capillary beds
Arteriols
Capillaries form beds between
Arteries and Veins